The invention relates to a combination drive type mould clamping mechanism of an all-electric injection molding machine, belonging to the field of mould clamping mechanisms of injection molding machines. The combination drive type mould clamping mechanism of the all-electric injection molding machine comprises mould adjusting nuts, a conventional motor, a support plate, a pull rod, a toggle mechanism, a dynamic mould plate, a mould, a fixed mould plate, a supporting angle, a hinge sleeve, a servo motor, an externally synchronous belt, a threaded screw rod, a threaded crosshead and an internally synchronous belt. The combination drive type mould clamping mechanism is designed by adopting a combination drive principle, and a power source of the combination drive type mould clamping mechanism is the servo motor and the conventional motor; the combination drive type mould clamping mechanism combines input motions generated by the servo motor and the conventional motor through a two-degree of freedom toggle mechanism and then generates programmable output motions; the system combines the advantages of the traditional mechanical system and a full-server electromechanical system, can realize the flexibility of the output motion and has high carrying capacity, fast operation and low cost.