Bismuth tungstate / polystyrene / polypropylene ( Bi₂WO₆/PS/PP ) composites were prepared by using polystyrene ( PS )-coated bismuth tungstate (Bi₂WO₆) as laser labeling additive. Scanning electron microscope, portable spectrophotometer, dynamic water contact angle measuring instrument, thermal loss, electronic universal testing machine and other testing methods were used to characterize the Bi₂WO₆/PS/PP composites prepared at different contents of Bi₂WO₆, laser intensities and linear velocities. The results show that the addition of PS-coated Bi₂WO₆ can significantly improve the laser marking performance of PP. When the mass fraction of Bi₂WO₆ is 0.015% , the laser marking power is 10 W, and the linear speed is 200 mm/s, the laser marking effect of Bi₂WO₆/PS/PP composite is the best. After the labeling of Bi₂WO₆/PS/PP composites, the pyrolysis produces amorphous carbon, and the crystal structure of Bi₂WO₆ does not change significantly during the laser labeling process.