The existing emulsion pump system with large flow rate in thin coal seams often requires the configuration of emulsion pumps according to peak working power,but the power requirements of different operating conditions vary greatly,and the energy loss of small load operating conditions is relatively large.In order to reduce energy loss in the system,a discrete variable emulsion pump system was proposed,two schemes were designed:the same rated flow rate and different rated flow rates.A single high-power emulsion pump was divided into four low-power pumps,with three working and one standby.According to different operating conditions and actions,the multi-level flow rate was output by controlling the opening and closing of the unloading valve to achieve power matching between supply and demand in the system;and when any of the pump was failed,a standby pump could be used to provide flow,improving the redundancy and fault tolerance of the system.Under the same working conditions,simulation analysis was conducted on the original system and discrete variable emulsion pump system.The results show that the proposed system can significantly reduce the peak power and energy consumption of the entire machine,the system energy consumption can be reduced by 47.6% under a single operating condition.The proposed system can gradually meet the liquid supply requirements of intelligent fully mechanized mining faces with high flow rate,high energy efficiency and high redundancy.