The submersible mixer is a device that has undergone years of practical exploration and innovation in form, structure, and testing methods, resulting in high cost-effectiveness and improved sewage mixing efficiency. It is mainly used in the process flow of sewage treatment plants to promote the mixing of suspended solids in sewage, slurry, industrial process liquids, etc., create water flow, strengthen mixing function, and prevent sludge sedimentation. It is a device for uniformly mixing and reacting solid, liquid, and gas three-phase media in municipal and industrial sewage treatment processes.