The invention relates to a polymer injection pump valve and belongs to the field of control on fluid conveyance. The polymer injection pump valve comprises a spring seat, a valve core, a ball and a valve seat, wherein an inner cavity is formed in the spring seat, and the spring seat is fixedly connected with the valve seat; liquid outlets communicated with the outside of the inner cavity are formed in the inner cavity; the outer side of the valve core is sleeved with a spring, one end of the spring is connected with the valve core in a clamped manner, and the other end abuts against the top end of the inner cavity of the spring seat; a liquid inlet communicated with the inner cavity is formed in the valve seat, and the valve core presses the ball under the pressure of the spring, so that the ball plugs the liquid inlet; guiding structures are arranged in the inner cavity, are fixed on the inner wall of the inner cavity and can clamp the ball to move in the length direction of the guiding structures. According to the polymer injection pump valve, the ball plugging the liquid inlet moves in the length direction of the guiding structures by the aid of the guiding structures, so that the problem that the service life of polymer injection pump valves in the related technology is shorter is solved; wear of the valve seat is reduced, and the service life of the polymer injection pump valve is prolonged.