Tensile properties and wear behaviors of AISI304 stainless steel after laser shock processing (LSP) with different processing parameters are investigated. Ultimate tensile strength (UTS) values and stress-strain curves of all four kinds of tensile samples are measured, and the improvement mechanism of UTS generated by LSP is also revealed. Wear properties and friction coefficients of AISI304 stainless steel with and without LSP are compared, and the influence rule of LSP on wear properties and friction coefficients of AISI304 stainless steel are systematically analyzed. The results show that LSP can improve the UTS of AISI304 stainless steel, which is due to the surface nanocystalization. In addition, LSP enhances the wear properties, and slightly increases the friction coefficients of AISI304 stainless steel.