For improving the efficiency of single-beam laser processing QR code, a parallel processing method based on spatial light modulator is proposed. The GS algorithm is used to generate a two-dimensional code multi-beam hologram with high beam uniformity, combined with a spatial light modulator and femtosecond laser to mark a QR code that can be effectively identified on the stainless steel surface. The effects of single pulse energy, pulse number, defocus amount and beam uniformity on the processing quality of QR codes are studied, and the optimal parallel processing parameters of QR codes are obtained through experiments.