Glue gun for repairing empty drum

The invention provides a glue gun for repairing an empty drum. The glue gun for repairing the empty drum comprises a glue injecting device, a hole punching device, an auxiliary device and a pressure gauge. The glue injecting device comprises a pipe body, a cover body and a glue pushing device, wherein the pipe body is provided with an opening in the far end. The near end of the pipe body is a cone-shaped body which is provided with an opening in the front end, and a glue outlet pipe is arranged at the opening. The glue outlet pipe is connected with the cone-shaped body in an integrated mode. The cover body is arranged at the outer portion of the far end of the pipe body. The glue pushing device is inserted from the middle of the cover body and extends into the inner portion of the pipe body. The hole punching device is inserted from the center of the glue pushing device and vertically extends to the outer portion of the glue outlet pipe. The glue pushing device can move in the pipe body. The near end of the g