The hydraulic support system in fully mechanized face is huge and complex, working environment is special, so emulsified pollution is an outstanding problem, which influences the performance and efficiency of the hydraulic support system, high pressure back flushing filter station is an important emulsion cleaning equipment in the system. The pollution control model is constructed, pollution equilibrium equations are derived for high pressure emulsion back flushing filter station in ore. Flow division coefficient and back flushing efficiency are introduced for back flushing time simulation research, that indicate the parameters influence relation for back flushing time, at last accuracy and feasibility of the pollution control simulation model is discussed by the comparison analysis of experimental and simulation results, the higher the back flushing efficiency is, the higher the flow division coefficient is, the shorter the back flushing time is, and the higher the cost is, the back flushing model based on pollution control is effective that provides a theoretical criterion for the optimal design of high pressure back flushing filter station.