The invention discloses balanced type triple-screw vibrating force field reinforced plasticizing mixing extrusion method and equipment. According to the method, an axial vibrating force field is added on a main screw of a triple-screw system, meanwhile, a bidirectional feeding manner is adopted, so that when the triple-screw system rotates, the main screw axially vibrates, and the material suffers from the shearing action and the axial vibrating extrusion grinding action at the same time in the triple-screw system, and thus increasing the mixing effect of the material. The equipment comprises a hydraulic excitation device, a triple-screw system, a measuring and control device, a driving motor and feeding hoppers, wherein two ends of the triple-screw system are respectively provided with the feeding hoppers, two ends of the main screw of the triple-screw system are respectively connected with the hydraulic excitation device and the driving motor, the measuring and control device is arranged at one side of the triple-screw system, and the driving motor and the hydraulic excitation device are respectively in electric connection with the measuring and control device. According to the invention, a conventional plasticizing mixing method is broken through, the vibrating force field is increased, and the plasticizing mixing effect of the material during conveying can be enhanced; and since bidirectional feeding is adopted, the axial resistance of the vibrating force field is eliminated.