diff --git a/client/operation.go b/client/operation.go
index 50ec565..03d68ed 100644
--- a/client/operation.go
+++ b/client/operation.go
@@ -1280,3 +1280,16 @@ func (c *QQClient) ImageOcr(url string) (*oidb2.OcrResponse, error) {
 	}
 	return nil, errors.New("image error")
 }
+
+// SendGroupSign 发送群聊打卡消息
+func (c *QQClient) SendGroupSign(groupUin uint32) (*oidb2.BotGroupClockInResult, error) {
+	pkt, err := oidb2.BuildGroupSignPacket(c.Uin, groupUin, c.version().CurrentVersion)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := c.sendOidbPacketAndWait(pkt)
+	if err != nil {
+		return nil, err
+	}
+	return oidb2.ParseGroupSignResp(resp)
+}
diff --git a/client/packets/oidb/group_sign.go b/client/packets/oidb/group_sign.go
new file mode 100644
index 0000000..0261ab5
--- /dev/null
+++ b/client/packets/oidb/group_sign.go
@@ -0,0 +1,54 @@
+package oidb
+
+import (
+	"errors"
+	"strconv"
+
+	"github.com/LagrangeDev/LagrangeGo/client/packets/pb/service/oidb"
+)
+
+// 群打卡
+
+type BotGroupClockInResult struct {
+	Title          string // 今日已成功打卡
+	KeepDayText    string // 已打卡N天
+	GroupRankText  string // 群内排名第N位
+	ClockInUtcTime int64  // 打卡时间
+	DetailURL      string // Detail info url https://qun.qq.com/v2/signin/detail?...
+}
+
+func BuildGroupSignPacket(botUin, groupUin uint32, appVersion string) (*Packet, error) {
+	body := &oidb.OidbSvcTrpcTcp0XEB7_1_ReqBody{
+		SignInWriteReq: &oidb.StSignInWriteReq{
+			Uin:        strconv.Itoa(int(botUin)),
+			GroupUin:   strconv.Itoa(int(groupUin)),
+			AppVersion: appVersion,
+		},
+	}
+	return BuildOidbPacket(0xEB7, 1, body, false, false)
+}
+
+func ParseGroupSignResp(data []byte) (*BotGroupClockInResult, error) {
+	var rsp oidb.OidbSvcTrpcTcp0XEB7_1_RspBody
+	_, err := ParseOidbPacket(data, &rsp)
+	if err != nil {
+		return nil, err
+	}
+
+	if rsp.SignInWriteRsp == nil || rsp.SignInWriteRsp.DoneInfo == nil {
+		return nil, errors.New("SignInWriteRsp or SignInWriteRsp.DoneInfo nil")
+	}
+
+	ret := &BotGroupClockInResult{
+		Title:       rsp.SignInWriteRsp.DoneInfo.Title,
+		KeepDayText: rsp.SignInWriteRsp.DoneInfo.KeepDayText,
+		DetailURL:   rsp.SignInWriteRsp.DoneInfo.DetailUrl,
+	}
+	if size := len(rsp.SignInWriteRsp.DoneInfo.ClockInInfo); size > 0 {
+		ret.GroupRankText = rsp.SignInWriteRsp.DoneInfo.ClockInInfo[0]
+		if size > 1 {
+			ret.ClockInUtcTime, _ = strconv.ParseInt(rsp.SignInWriteRsp.DoneInfo.ClockInInfo[1], 10, 64)
+		}
+	}
+	return ret, nil
+}
diff --git a/client/packets/pb/service/oidb/OidbSvcTrpcTcp0xEB7_1.pb.go b/client/packets/pb/service/oidb/OidbSvcTrpcTcp0xEB7_1.pb.go
new file mode 100644
index 0000000..5be0421
--- /dev/null
+++ b/client/packets/pb/service/oidb/OidbSvcTrpcTcp0xEB7_1.pb.go
@@ -0,0 +1,33 @@
+// Code generated by protoc-gen-golite. DO NOT EDIT.
+// source: pb/service/oidb/OidbSvcTrpcTcp0xEB7_1.proto
+
+package oidb
+
+type OidbSvcTrpcTcp0XEB7_1_ReqBody struct {
+	SignInWriteReq *StSignInWriteReq `protobuf:"bytes,2,opt"`
+	_              [0]func()
+}
+
+type StSignInWriteReq struct {
+	Uin        string `protobuf:"bytes,1,opt"`
+	GroupUin   string `protobuf:"bytes,2,opt"`
+	AppVersion string `protobuf:"bytes,3,opt"` // 不确定要不要加，测试过没有这个参数也是可以的
+	_          [0]func()
+}
+
+type OidbSvcTrpcTcp0XEB7_1_RspBody struct {
+	SignInWriteRsp *StSignInWriteRsp `protobuf:"bytes,2,opt"`
+	_              [0]func()
+}
+
+type StSignInWriteRsp struct {
+	DoneInfo *SignInStatusDoneInfo `protobuf:"bytes,2,opt"`
+	_        [0]func()
+}
+
+type SignInStatusDoneInfo struct {
+	Title       string   `protobuf:"bytes,1,opt"` // 今日已成功打卡
+	KeepDayText string   `protobuf:"bytes,2,opt"` // 已打卡N天
+	ClockInInfo []string `protobuf:"bytes,3,rep"` // ["群内排名第N位", "[clock in timestamp (second)]"]
+	DetailUrl   string   `protobuf:"bytes,4,opt"` // https://qun.qq.com/v2/signin/detail?...
+}
diff --git a/client/packets/pb/service/oidb/OidbSvcTrpcTcp0xEB7_1.proto b/client/packets/pb/service/oidb/OidbSvcTrpcTcp0xEB7_1.proto
new file mode 100644
index 0000000..d12ba5c
--- /dev/null
+++ b/client/packets/pb/service/oidb/OidbSvcTrpcTcp0xEB7_1.proto
@@ -0,0 +1,30 @@
+syntax = "proto3";
+
+option go_package = "github.com/LagrangeDev/LagrangeGo/client/packets/pb/service/oidb";
+
+// see https://github.com/LagrangeDev/Lagrange.Core/blob/47b819d43ad101a1a066a3f8afa094d000fe19f5/Lagrange.Core/Internal/Packets/Service/Oidb/Request/OidbSvcTrpcTcp0xEB7_1.cs
+
+message OidbSvcTrpcTcp0xEB7_1_ReqBody {
+  optional StSignInWriteReq signInWriteReq = 2;
+}
+
+message StSignInWriteReq {
+  string Uin        = 1;
+  string GroupUin   = 2;
+  string AppVersion = 3; // 不确定要不要加，测试过没有这个参数也是可以的
+}
+
+message OidbSvcTrpcTcp0xEB7_1_RspBody {
+  optional StSignInWriteRsp signInWriteRsp = 2;
+}
+
+message StSignInWriteRsp {
+  optional SignInStatusDoneInfo doneInfo = 2;
+}
+
+message SignInStatusDoneInfo {
+  string Title = 1;                // 今日已成功打卡
+  string KeepDayText = 2;          // 已打卡N天
+  repeated string ClockInInfo = 3; // ["群内排名第N位", "[clock in timestamp (second)]"]
+  string DetailUrl = 4;            // https://qun.qq.com/v2/signin/detail?...
+}