In view of the poor liquid absorption performance of the large flow emulsion pump, the mathematical model of suction pressure, pressure loss and pipeline parameters of the suction hose at the valve mouth is established. The effect of the suction pipe on the pump volume efficiency is analyzed, and the simulation model of a single emulsion pump system is established by using AMESim software to simulate the dynamic characteristics of the emulsion pump. The effects of suction pressure, pressure loss, pipe length and pipe diameter on the performance of pump hydraulic end are studied, and some relevant measures are proposed to increase the suction pressure, reduce the loss of pipeline pressure and optimal the pipe length and pipe diameter, which will provide important reference value for the design and optimization of the liquid suction pipeline of the emulsion pump.