A push-type transmission mechanism has a base, a plurality of fixing discs securely mounted on the base, and a driving component rotatably mounted on the base. The driving component includes a plurality of cam portions. Each fixing disc has a plurality of driven rolling components which can move in radial directions of the fixing discs and can protrude out of outer surfaces by abutment of the cam portions. An inner surface of a transmission block forms a corrugation structure extending continuously in a circumferential direction. The corrugation structure is abutted by the driven rolling components. Thus, speed is changed through the driven rolling component connecting to the corrugation structure. Besides, with the driven rolling components driven by the cam portions, power can be transmitted with high torque.