As the core component of the hydraulic end of the plunger pump, the emulsion pump head body bears great pressure. Therefore, the finite element analysis of the pump head body is of great significance for improving the reliability and rationality of product design. Due to the particularity of the pump head body structure, studying its processing technology and improving processing efficiency are the keys to reducing production costs and improving product competitiveness. Analyze the movement law of the plunger pump, the pulsating flow rate and the pressure fluctuation caused by the pulsating flow rate, so as to obtain the relevant factors that cause the pressure fluctuation, and provide a theoretical basis for the design and improvement of the plunger pump, and also for the analysis of the pump head body The state of force provides an important theoretical basis.