The ZW Self-priming Sewage Pump is a product successfully developed by engineering and technical personnel by absorbing domestic and foreign technologies and combining the actual situation of my country's electromechanical industry. The pump combines self-priming and non-clogging sewage discharge in one through the novel structure of the impeller and the pump body. It does not need to press the bottom valve or lead water like a general clean water self-priming pump. It can also pump dirt containing large particles of solid blocks and fibers, sediments, waste mine impurities, feces and all engineering sewage, completely reducing the labor intensity of workers. It is easy to use, move and install, requires very little maintenance and has stable performance.