Glue gun with adjustable extrusion amount

The glue gun comprises a gun stock, a fixing hole, a grip and a wire, a fixing bolt is installed at one end of the gun stock, the fixing hole is formed in the fixing bolt in a penetrating mode, an electric telescopic rod is installed on the inner side of the gun stock in a connected mode, the grip is installed at the bottom of the gun stock, and the wire is connected with the electric telescopic rod. A wire is installed at the bottom of the grip, and a storage battery is installed in the grip. The gun stock and the grip are provided with the pressing switch, the timing reversing switch and the electric telescopic rod, the reversing time of the timing reversing switch is set before the device is used, so that the pressing switch is communicated with electric energy, the electric energy can be conducted into the timing reversing switch through the pressing switch, and the timing reversing switch conducts the electric energy into the electric telescopic rod; and when the reversing time of the timing reversing sw