The invention discloses a plasticizing apparatus. The apparatus comprises a motor, a driving device, a driving shaft, a plasticizing front board supported at the front end of the driving shaft through a deep groove ball bearing, and a plasticizing backboard supported at the back end of the driving shaft through an aligning roller bearing, the plasticizing backboard is upwardly provided with a motor fixing board for fixedly mounting the motor, a positioning projection used for fixation is arranged at the front end of the motor, the motor fixing board is provided with a positioning hole for the penetration of the positioning projection, the driving device comprises a small belt wheel fixedly mounted on the output shaft of the motor, a large belt wheel fixedly mounted on the driving shaft, and a synchronous belt connecting the small belt wheel with the large belt wheel, the central portion of the back end of the driving shaft is in threaded connection with a screw, the screw penetrates through the plasticizing backboard, and a thrust ball bearing is arranged between the head portion of the screw and the plasticizing backboard. The plasticizing apparatus adopting the motor to drive has the characteristics of small energy consumption, small noise, stable output torque, simple structure, low cost, small inertia and good performances.