The water pump casing includes a casing main body and a casing support body. The casing support body is fixed inside the fire compartment, and the casing main body is connected to the casing support body through a flat lock. The casing support body and the casing main body are made of steel glass material, and the casing main body is connected to the casing support body through four flat locks, which not only has good sealing performance, but also provides great convenience for firefighters to disassemble the casing main body for maintenance and other purposes. The cover of the water pump system is made of steel glass, which has a better noise reduction effect compared to aluminum. Moreover, the steel glass is easy to shape, making the cover more aesthetically pleasing.