Injection molding mechanism for PLA degradable plastic

The invention relates to the technical field of injection molding machines, in particular to a PLA degradable plastic injection molding mechanism which comprises a supporting frame, an injection mold, a driving unit and an extrusion unit, an injection cylinder is mounted on the extrusion unit, the injection molding mechanism further comprises an extrusion screw and an injection head, the extrusion screw used for cutting and crushing raw materials is rotatably mounted in the injection cylinder, and the injection head is mounted in the injection cylinder. A material injection head for discharging is mounted at the front end of the material extrusion screw rod; the material injection head slides in the independent cavity so that the material extrusion screw can concentrate on material treatment, and then the material injection precision of the injection molding mechanism is improved, and the working energy consumption is reduced. The injection head used for discharging is mounted at the front end of the extrusio