The invention discloses a water pump with a convenient-to-replace blade. The water pump comprises a water pump body, wherein the right side of the water pump body is fixedly connected with a rotating shaft; a blade body is arranged on the surface of the rotating shaft in a sleeving manner; a clamping sleeve is arranged on the right side of the rotating shaft; the right side of the rotating shaft extends into the clamping sleeve; the top of the clamping sleeve is fixedly connected with a pressing plate; and a support pillar and a baffle are fixedly connected to the bottom of the inner wall of the rotating shaft from left to right. As the water pump body, the rotating shaft, the blade body, the cutting sleeve, the pressing plate, the support pillar, the baffle, a supporting plate, fixing blocks, a clamp block, a connecting rod, a limited block, first connecting pillars, tension springs, clamping plates and second connecting pillars are arranged to work together, the problem that a blade mounted in a conventional interference fit manner is inconvenient to detach is solved. The water pump with the convenient-to-replace blade has the advantage that the blade is convenient to replace, time required for a user to detach the blade is shortened, the detachment efficiency is improved, and convenience is brought for the user to use the water pump.