Abstract: In this paper, the BC800 mud pump truck for directional drilling rigs in coal mines is used as the research object, combined with the calculation formula of the instantaneous flow of the three-piston reciprocating mud pump, the flow superposition effect of the main and auxiliary mud pumps working at the same time is analyzed, Python language programming calculates and draws the flow unevenness coefficient and instantaneous flow curve of the mud pump in parallel operation, compares the effect of different initial phase angles on the flow uneven system, and proposes application measures to improve the flow pulsation for the mud pump truck, Which provides practical guidance for the design and use of the mud pump truck.