Improved horizontal centrifugal pump

The utility model relates to the technical field of water pumps, in particular to an improved horizontal centrifugal pump which comprises a filter box, a cleaning mechanism is arranged on the inner wall of the filter box, a water inlet pipe is communicated with the inner wall of the filter box, a slag storage groove is clamped to the inner wall of the filter box in a sliding mode, and a handle is fixedly connected to the front end face of the slag storage groove. And a filter plate is slidably clamped on the inner wall of the filter box. Impurities in water are filtered out through a filter plate, an impeller is prevented from being damaged, when many impurities are accumulated on the surface of the filter plate, a hand wheel is driven to rotate, the hand wheel drives a double-end stud to rotate, the double-end stud drives a sliding block to move, the sliding block drives a connecting rod to move, the connecting rod drives a transverse plate to move, the transverse plate drives a round rod to move downwards,