Hydraulic clay gun

The utility model discloses a hydraulic mud gun, which is invented to solve the problem that the piston rod is sprained in the prior art, and comprises an elliptic base, a spindle, a holding frame, a reinforcing plate, a big arm, a regulating rod, a hanging device and a knockout assembly; wherein, the knockout assembly at least comprises a gun body, a hydraulic mud pushing cylinder positioned in the gun body, and a hanging piston positioned on the mud pushing cylinder, wherein, the mud pushing cylinder is a movable-cylinder-type mud pushing cylinder. When the device is operating after the cylinder action type mud pushing cylinder is adopted, the piston rod is immobile, the cylinder drives the mud plug to knock the mud into the tap hole of the furnace through the mud cylinder and the gun nozzle, so as to prevent mortar from falling into the protective barrel and accordingly prevent the damage to the piston rod.