A sewage pump is a pump integrated with a motor that operates submerged in liquid. Compared to general horizontal pumps or vertical sewage pumps, the sewage pump has a compact structure and takes up less floor space. It is easy to install and maintain; large-scale sewage pumps usually come with an automatic coupling device for easy installation and maintenance. It has a long continuous running time. Due to the same shaft for both the pump and the motor, the shaft is short, the rotating parts are lightweight, which results in a relatively smaller load on the bearings (radial) and a much longer lifespan compared to general pumps. There is no cavitation damage or water filling issues. Especially the latter greatly facilitates operators. It has low vibration and noise, low motor temperature rise, and is environmentally friendly.