The invention relates to the field of waste plastic recycle, and aims at providing a broken plastic regeneration plasticizer. The broken plastic regeneration plasticizer comprises a machine base, a cutting-mixing pre-plasticizing device, a main plasticizing device and a vacuum suction filter device, wherein the cutting-mixing pre-plasticizing device is provided with a feeding hopper and a discharging port; the main plasticizing device comprises a cylinder which is provided with a cylinder heating device and connected with the machine base, a middle rod, two ends of which are connected with the cylinder, a plurality of main spiral push rods, two ends of which are pivoted with the cylinder, and a push rod driving device; an auxiliary spiral push rod is arranged in the interspace outside every two adjacent main spiral push rods; two ends of the auxiliary spiral push rods are pivoted with the cylinder; and the cylinder is provided with a plasticizing inlet which is arranged at the rear part of the side of the cylinder and communicated with the discharging port, a plasticizing outlet which is located at the front end of the cylinder, and an exhaust vent which is communicated with the inlet of the vacuum suction filter device.