This submersible sewage pump is widely used in municipal sewage treatment plants, residential drainage systems, factory wastewater discharge stations, hospitals, hotels, underground parking lots, subway stations, tunnel drainage, temporary drainage at construction sites, and rural irrigation and drainage. The pump is typically submerged in the liquid, where the motor drives the impeller to rapidly pump out sewage, slurry, or liquids containing solid particles. It can be combined with an automatic coupling device for unattended operation or linked to a liquid level control system for automatic start and stop, ensuring efficient, safe, and continuous drainage.