The invention relates to the field of synchronous wheels, in particular to a transmission synchronous wheel with high traction. The transmission synchronous wheel with high traction comprises a synchronous wheel body, a synchronous wheel check ring and set screws, wherein the synchronous wheel body and the synchronous wheel check ring are both made of aluminum alloy, the synchronous wheel check ring is arranged at the two ends of the synchronous wheel body in a close fit manner, a motor connecting end is integrally formed at one end of the synchronous wheel body, a shaft hole for installing the output end of a motor is formed in the synchronous wheel body, and at least one threaded hole for installing the set screws is formed in the motor connecting end. According to the transmission synchronous wheel with high traction, because the check ring is installed on the two sides of the synchronous wheel body in the close fit manner, and the diameter of the outer ring of the check ring is larger than that of the excircle of the synchronous wheel body, it is avoided that a synchronous belt slides off under the working condition of high traction; and at least one threaded hole for installing the set screws is formed in the motor connecting end of the synchronous wheel body, the driving shaft which is inserted into the shaft hole of the synchronous wheel body is fixed by more than one set bolt, so that it is avoided that under the working condition of high traction, the synchronous wheel body and the driving shaft turn relative to each other.