The system uses compressed air to control the automatic charging gun of the high-pressure charging tank to inject the pre sent foam particles into the high-pressure charging tank, and the top pneumatic vent valve is closed. When the mold needs materials, control the mold feeding automatic material gun to inject foam particles into the mold cavity under high pressure, so that the beads are evenly distributed in the mold cavity, reducing white mold defects. After the filling is completed, the return action starts, and the remaining foam particles in the pipeline are returned to the charging tank for next use. Especially suitable for products with high precision requirements and relatively thin white molds without feeding seams.