The work aims to improve the tribological properties on the surface of fracturing pump plunger. Based on the steady-state two-dimensional incompressible Reynolds equation, the theoretical model of grooved surface textured plunger dynamic pressure lubrication was established. Then, the finite difference method and Gauss-Seidel iteration method were used to solve the oil film pressure distribution and shear stress on the plunger surface. Furthermore, the oil film bearing capacity and friction coefficient were obtained, and the numerical analysis of the influence of the minimum oil film thickness, the depth, the cross-sectional shape, the area ratio and the distribution angle of the texture on the bearing capacity and friction coefficient of the plunger seal surface was carried out. As a result, with the texture depth of the rectangular groove increasing from 2 to 40 μm, the dynamic lubrication performance of the texture first increased and then decreased. When the texture depth was about 0.6 times the minimum oil film thickness, the dynamic lubrication performance of the texture reached the maximum and the larger the minimum oil film thickness, the worse the dynamic pressure effect of the texture. The order of dynamic pressure lubrication performance of four cross-section groove textures was: rectangular>convex stepped type>ellipse>V type. With the texture width increasing from 100 to 480 μm, the oil film bearing capacity increased first and then decreased. When the width was 360 μm (72% area ratio), the oil film bearing capacity reached the optimum. In the groove texture of the six distribution angles, the 60° rectangular groove texture exhibited the best lubrication and wear reduction performance. In the hydrodynamic lubrication range, the minimum oil film thickness should be appropriately reduced, the bottom of the groove texture should be as flat as possible, the texture depth should be slightly smaller than the minimum oil film thickness, and the texture length of the oil film convergence region in the vertical direction should be longer, so that the groove-shaped surface texture with better lubrication and wear reduction performance can be obtained. The groove-like texture with reasonable parameters can greatly improve the bearing capacity of the oil film on the surface of the fracturing pump plunger and reduce the coefficient of friction, thus prolonging the service life of the plunger seal pair.