The invention relates to the field of waste
plastic recycling, and discloses an injection mold for waste
plastic recycling, the injection mold comprises a fixed mold base, an injection base and a movable mold base, a mounting groove and a mold cover are arranged on the side, facing the injection base, of the fixed mold base, a
piston is arranged in the mounting groove in a sleeved mode, and a plurality of ejector pins are vertically arranged on one side of the
piston; the
tail end of the ejector pin extends into a pin hole formed in the bottom of the mounting groove, and during mold closing injection molding, the
piston moves to be close to the bottom of the mounting groove, so that the
tail end of the ejector pin is flush with a hole opening, close to a mold cavity of the injection mold, of the pin hole, and during mold opening after injection molding is finished, air is injected into the area, located between the bottom of the mounting groove and the piston, of the mounting groove firstly, and
positive pressure is formed in the area; meanwhile, the piston is far away from the groove bottom of the mounting groove, the
tail end of the ejector pin gradually leaves the pin hole, the area, located between the tail end of the ejector pin and the injection molding workpiece, of the pin hole is named as a cooling area, and air can enter the cooling area under the
positive pressure along with leaving of the ejector pin, so that the cooling area is compensated and kept at normal pressure.