To study the influence of shot peening on the surface integrity of steel H13 under different intensities, the surface roughness, hardness, residual stress and surface microstructure of specimen were investigated by white-light interferometer, microhardness tester, XRD, SEM and EBSD, and the grain size, grain boundary misorientation and texture of surface layer before and after 0.33 A shot peening were analyzed quantitatively. The results show that the surface integrity of steel H13 are all changed after shot peening under different intensities, and the shot peening can improve the surface roughness and microhardness, and induce the residual compressive stress layer with a certain depth at the same time. Therefore, comparing with the specimen without shot peening, the surface roughness of steel H13 is increased by 152% after 0.23 A shot peening, and the depth of hardening layer is increased from 100 μm to 160 μm as well as the depth of residual compressive stress layer increased from 200 μm to 300 μm with the shot peening intensity increasing from 0.23 A to 0.33 A. However, for none shot peened specimen, the average grain size is 950 nm, and the average grain boundary misorientation is 33.5858° due to {001}<100> and {110}<111> mixed textures with weak strength existing in the specimen. Furthermore, after 0.33 A shot peening, there are two kinds of {111}<uvw> and {hkl}<110> plate textures in the microstructure at the region 10 μm away from the surface with a depth of grain refinement layer more than 30 μm, and the average grain size is refined to 470 nm, and the average grain boundary misorientation increases to 39.0228°.