The utility model discloses a centrifugal pump suitable for well low discharge operating mode, pump body center axial position are equipped with sunction inlet, impeller cavity in proper order, and impeller cavity upper portion is equipped with the discharge port, and the impeller cavity left side is linked together with the sunction inlet, and impeller cavity upper portion is linked together with the discharge port, and the impeller passes through impeller nut to be fixed at the pump shaft left end, and the pump shaft other end is connected with the motor through mechanical seal, journal bearing, footstep bearing, the utility model discloses set up a big oil tank between journal bearing and footstep bearing, can play lubricatedly and refrigerated effect, effectively extend bearing's life, the impeller is multiple -blade open architecture, makes simple, washing convenience, is applicable to the low discharge transmission, the pump shaft is equipped with axle sleeve, effectively corrosion prevention nature liquid corrosion pump shaft with carrying the fluid contact part, the bearing body adopt to forge the car machine -shaping, and intensity is good, is applicable to low discharge operating mode among petrochemical, papermaking pharmacy, coal industry and other industrial process.