Drencher for animal husbandry and veterinary medicine

The drencher comprises a gun handle and a gun body fixedly installed at the top of the gun handle, torsional springs are fixedly installed in the gun handle and a pressing handle, a piston rod is connected to the top of the pressing handle in a sleeved mode, a piston is fixedly installed on one side of the piston rod, and the other side of the piston rod is provided with a piston rod. A sealing ball is fixedly installed on the side, away from the fixing block, of the spring, and a sealing ring is fixedly installed on the inner side wall of the control pipe. When drenching is needed, the handle is pressed forwards, the sealing ball is squeezed by medicine in the gun body so as to jack the spring open, the medicine passes through the control tube, after all the medicine in the gun body passes through the control tube, the spring can push the sealing ball to touch the sealing ring, the pressing handle moves backwards under the action of the torsion spring, and due to the fact that air cannot enter the gun body,