The invention relates to a rotating disc type multi-component injection mold closing device which is designed for solving the technical problem that a special injection molding machine in existing rotating disc type injection molding machines is poor in precision, easy to skew, limited in bearing capacity and relatively high in failure rate. The mold closing device comprises a movable mold plate,an upper mold plate, a lower mold plate, a guide pillar and a mold separating and closing mechanism. A rotary disc is arranged at the bottom of the movable mold plate. The key point is as follows: a rotating disc positioning device, a torque motor and a dividing rotating joint are arranged in the movable mold plate, the motor shaft of the torque motor is connected to the rotating disc, a mold ejecting device is arranged at the top of the movable mold plate, a rolling limiting block is arranged on the movable plate at the edge of the rotating disc, and a wear-resistant sheet and a cross-shapedoil-water head cavity hole are formed in the bottom of the rotating disc; a jacking slot is formed in the movable mold plate at the connection of the movable mold plate and the rotating disc, and an elastic universal jack is arranged in the jacking slot; and the torque motor comprises an embedded bearing and an encoder, and a load of the torque motor is connected to a rotor. The rotating disc typemulti-component injection mold closing device serves as a mold closing device of a rotating disc type multi-component injection molding machine.