The invention provides a plunger pump valve seat puller. The plunger pump valve seat puller comprises a motor, a centralizing frame, a pull rod and a pull head, wherein the motor is connected with a power line, the power line is provided with a control switch, one end of the motor is connected with a speed reducer, and an output shaft of the speed reducer is provided with external threads; the centralizing frame is fixedly connected to the speed reducer, and the middle part of the centralizing frame is provided with a non-circular hole directly facing the output shaft; the pull rod penetratesthrough the non-circular hole, the outer side wall of the pull rod is matched with the inner edge of the non-circular hole, and the inner end of the pull rod is provided with an internal screw hole inthread fit with the output shaft; and the pull head is connected to the outer end of the pull rod, and the two sides of the pull head are provided with pawls. After the plunger pump valve seat pullerprovided by the invention is electrified, the motor drives the pull rod to pull a valve seat, the pull rod extends and retracts quickly, the operation can be performed by only one person, much manpower can be saved, and the work efficiency is improved.