The invention provides a novel high speed glue gun comprising a gun body, a piston rod, an elastic element and a gas valve, wherein a telescopic cavity is arranged on the inner side of the upper partof the gun body, and a dispensing cavity is arranged on the inner side of the lower part of the gun body. The piston rod is inserted in the gun body, the upper end of the piston rod is located in thetelescopic cavity, and the lower end of the piston rod is located in the dispensing cavity. The upper end of the piston rod is provided with a horizontal sealing disc in close contact with the inner wall of the telescopic cavity. The bottom of the telescopic cavity is provided with a gas hole connected to the gas valve, the elastic element is installed in the telescopic cavity, the lower end of the elastic element is connected with the upper end of the piston rod, and the upper end of the elastic element is connected with the upper wall of the telescopic cavity. The upper part of the dispensing cavity is provided with a feeding port, the bottom of the dispensing cavity is provided with a discharging port, and the bottom end of the piston rod is pressed against the discharging port to forma sealing structure. The glue gun has the advantages of simple structure and high dispensing speed.