A transmission mechanism of a motor cam operating mechanism for switch electrical apparatus, wherein the transmission mechanism is in coordination with a cam driven by a motor and is arranged on sides of the cam, the transmission mechanism and the cam are both mounted between two side plates, the transmission mechanism comprising: a link lever, an outer end of the link lever is provided with a pin hole and an inner end of the link lever is provided with a chute; a cam shaft pin passes through the chute and is fastened on the cam; when the cam rotates, the cam shaft pin moves in the chute, when the cam shaft pin contacts with an end of the chute, the cam drives the link lever to move through the cam shaft pin; a roller is mounted between the pin hole and the chute; a fan-shaped lever, the fan-shaped lever is mounted on the two side plates via a main shaft and an auxiliary shaft, the fan-shaped lever is provided with a first chute; a spring mechanism, the bottom of the spring mechanism is rotatably mounted on the side plates and the top of the spring mechanism is provided with a hole; a thrust shaft pin, the thrust shaft pin passes through second chutes on two side plates, the first chute on the fan-shaped lever, the hole on the top of the spring mechanism, and the pin hole on the outer end of the link lever, the thrust shaft pin makes linkage of the link lever, the fan-shaped lever and the spring mechanism; when the cam rotates, the cam drives the thrust shaft pin to compress the spring mechanism via the link lever so that the spring mechanism stores energy; in an energy storing phase of the spring mechanism, the thrust shaft pin moves in the first chute of the fan-shaped lever, there is no interaction between the thrust shaft pin and the fan-shaped lever, the fan-shaped lever remains stationary and a contact remains stationary; in an energy releasing phase of the spring mechanism, the thrust shaft pin moves to an end of the first chute and interacts with the fan-shaped lever, the fan-shaped lever rotates and drives the contact to move via the main shaft. a link lever, an outer end of the link lever is provided with a pin hole and an inner end of the link lever is provided with a chute; a cam shaft pin passes through the chute and is fastened on the cam; when the cam rotates, the cam shaft pin moves in the chute, when the cam shaft pin contacts with an end of the chute, the cam drives the link lever to move through the cam shaft pin; a roller is mounted between the pin hole and the chute; a fan-shaped lever, the fan-shaped lever is mounted on the two side plates via a main shaft and an auxiliary shaft, the fan-shaped lever is provided with a first chute; a spring mechanism, the bottom of the spring mechanism is rotatably mounted on the side plates and the top of the spring mechanism is provided with a hole; a thrust shaft pin, the thrust shaft pin passes through second chutes on two side plates, the first chute on the fan-shaped lever, the hole on the top of the spring mechanism, and the pin hole on the outer end of the link lever, the thrust shaft pin makes linkage of the link lever, the fan-shaped lever and the spring mechanism; when the cam rotates, the cam drives the thrust shaft pin to compress the spring mechanism via the link lever so that the spring mechanism stores energy; in an energy storing phase of the spring mechanism, the thrust shaft pin moves in the first chute of the fan-shaped lever, there is no interaction between the thrust shaft pin and the fan-shaped lever, the fan-shaped lever remains stationary and a contact remains stationary; in an energy releasing phase of the spring mechanism, the thrust shaft pin moves to an end of the first chute and interacts with the fan-shaped lever, the fan-shaped lever rotates and drives the contact to move via the main shaft.