The invention discloses a water pump pressure controller capable of achieving precise control. The water pump pressure controller comprises a shell and an induction membrane arranged in the shell. Anupper locating sleeve pipe is arranged in the shell, and a balance pressure spring is arranged in the upper locating sleeve pipe. The induction membrane comprises a movable substrate, a fixed ring anda telescopic ring connected with the movable substrate and the fixed ring. Supporting substrates are embedded in the fixed ring and the movable substrate correspondingly. The telescopic ring is in acorrugated shape. A lower locating sleeve pipe is arranged on the upper surface of an abutting disc. Multiple avoiding grooves are formed in the upper locating sleeve pipe. A locating rib piece is formed between every two adjacent avoiding grooves. Locating clamp grooves are formed in the positions, corresponding to the locating rib pieces, of the lower locating sleeve pipe. The lower ends of thelocating rib pieces are inserted into the corresponding locating clamp grooves. According to the water pump pressure controller, the influence of the shape and size errors of the induction membrane onthe starting pressure of a water pump can be effectively avoided, the balance pressure spring can be fully located in the axial length, and therefore the balance pressure spring is effectively prevented from being bent and deforming, and stable output of a water pump control signal is ensured.