Abstract: Production system of mine was classified according to energy consumption intensity of large-scale electromechanical equipment and main energy consuming equipments of each subsystem were listed. Electricity consumption of large-scale electromechanical equipment in mine was gotten according to relevant information of a coal mine, and influence factors on energy consumption of the equipment were summarized. Formula of energy consumption of the equipment was derived in details, and working efficiency of the equipment was optimized by use of the best square approximation method for calculating energy consumption of the equipment according to the optimization results. A design scheme of coordinative control system of large-scale electromechanical equipment in mine based on Internet of things was introduced. The actual application shows that coordinative control method of large-scale electromechanical equipment in mine based on efficiency optimization can effectively reduce energy consumption of coal mine production.