Detachable automatic feeding pump

The utility model discloses a detachable automatic feeding pump, which comprises a pump cylinder, a pump seat, a liquid pumping pipe and a valve rod, the pump cylinder is fixed on a top sealing cover of the pump seat through a connecting plate, the liquid pumping pipe is fixed at the bottom of the pump seat, a liquid outlet pipe is arranged on the side wall of the pump seat, and the valve rod is provided with a top pneumatic piston and a bottom suction piston. The top pneumatic piston is sleeved with the pump cylinder, the bottom suction piston is sleeved with the liquid suction pipe, the side wall of the bottom of the liquid suction pipe is connected with a telescopic sleeve in a sleeved mode, a first limiting ring table and a second limiting ring table are arranged on the inner wall of the telescopic sleeve, and a first limiting boss is arranged on the outer side wall of the bottom of the liquid suction pipe. A telescopic spring is connected between the first limiting boss and the first limiting ring table