Electric submersible pump unit for mining is characterized by its water resistance, which not only applies for pre-draining (main drainage and permanent drainage) of mine aquifer, but also serves as the only option for dealing with mine sudden flooding and drainage for mine recovery, as well as the essential equipment for resisting mine flood disaster. The submersible pump as a precaution measure for drainage avoids disaster relief and makes sure the pump station can always operate under non-accident state. It is adopted by the National Center for Disaster Relief and many large mining groups (coal mine, iron mine, colored mine, non-metallic mine etc.), and has played important roles in the rescue work of extra serious and major water disasters. In addition, it is the efficient supporting product recommended in the No.28 Prescription for Water Prevention and Control of State Administration of Work Safety. The inherent characteristic of submersible pump determines its rigid demand, which becomes essential and necessary equipment for personal safety and production safety.