Sand and gravel pump is a single-stage, single suction, cantilever, horizontal, centrifugal slurry pump, mainly used for conveying strong abrasive particles that are too big for general slurry pump to transport, such as granular coal, metal smelting slag and root crops, as well as for dredger, river dredging, mining and other fields. The pump is especially suitable for large flow quantity, high concentration, high head working conditions, and for transporting high temperature strong abrasive slurry owing to its excellent cavitation resistance and abrasion resistance.