Submersible sewage pump is a kind of pump product which is connected with a pump and a motor, and at the same time, it is submerged into the underwater work. The submersible sewage pump can tear and disconnect the long chemical fiber, bag, belt, grass, cloth and other chemical substances in the wastewater, and then discharge them successfully. It is especially suitable for transporting the liquid with hard solid and chemical fiber substances and the especially dirty, sticky and slippery liquid. Nine advantages of submersible sewage pump: 1. it can be applied in the full head range to ensure the motor load. 2. the cable float switch can automatically control the start and termination of the system pump according to the required water level change, without the care of full-time personnel. 3. the double slide rail automatic installation system software provides a great degree of convenience for installation and maintenance, and people can enter and exit the waste water pit without any need. 4. the selection is of good technicality, with strong sewage treatment capacity, no blockage, and can efficiently φ 30～ φ 80mm solid particles. 5. the torn tissue can tear and disconnect the chemical fiber and strong chemicals, and then discharge them successfully without adding a filter screen to the pump. 6. the design scheme is effective, the motor rated power of supporting facilities is small, and the effect of environmental protection and energy saving is remarkable. 7. the automatic maintenance control box is configured to carry out reasonable maintenance on the power running, water seepage and load of the equipment, and improve the safety factor and stability of the goods. 8. the mechanical seal with brand-new raw materials can make the pump operate safely for more than 8000 hours. 9. compact structure, convenient movement, convenient installation and operation, which can reduce the project budget without building a water pump house.