In order to reduce the energy consumption of coal mine water pretreatment system and find out the energy-saving potential, the method of specific energy consumption was used to analyze the energy consumption of mine water lifting and treatment, preparation and dosing of chemical agents and coal slurry treatment. The energy saving approaches were put forward. The results showed that in the mine water pretreatment system, the energy consumption proportion of lifting treatment, coal slurry treatment, chemical agents preparation and dosing was 79.98%, 13.73% and 5.80%, respectively. With the expansion of the actual treatment scale, the overall energy consumption of pretreatment decreased, which was closely related to the pretreatment process, flow design and layout planning and other factors. There was great potential for energy saving and consumption reduction in the mine water pretreatment system. It could be optimized by high-efficiency mechanical and electrical equipments, frequency conversion automatic control technology, water quality monitoring and energy conservation management.