In this paper, the erosive wear characteristics of pump valve gap flow field in the operation process of fracturing pump valve, including the main influence factors and their influence law was studied. Based on the theory of the solid-liquid two-phase flow and the erosion model, the computational fluid dynamics (CFD) method was used to simulate the erosive wear behavior in pump valve gap flow field. The effect of particle size, particle mass flow rate, semi-cone angle, seat inlet radius and valve disc lift were analyzed. According to the results, the erosion mainly consisted of the direct impact on the edge of the valve plane and the cutting action on the cone of the valve seat. With particle size increasing from 0.062 5 mm to 0.375 mm, maximum erosion rate of the pump valve increased by 4.80 times. While particle size increased to 1.5 mm, maximum erosion rate reduced by 76.12%. When particle mass flow rate increased from 5 g/s to 25 g/s, the maximum erosion rate increased by 3.84 times. As the semi-cone angle increased from 30° to 50° and the valve disc lift increased from 5 mm to 15 mm, the maximum erosion rate reduced by 95.55% and 92.57%, respectively. With the seat inlet radius increasing from 30 mm to 50 mm, maximum erosion rate increased by 10.47 times. At the same time, the distribution of erosion wear area is significantly affected by the increase of valve disc lift. It is condufed that maximum erosion rate of pump valve first increases and then decreases with the increase of particle size, and it increases with the increase of particle mass flow rate and inlet radius of valve while it decreases with the increase of semi-cone angle and valve disc lift. The effect of pump valve structure parameters on valve erosion wear is more significant.