The utility model provides a drive mechanism of biax breaker, the intermediate position on frame upper portion is fixed through antifriction bearing respectively in the both ends of arbor, antifriction bearing and the coaxial band pulley that sets up are worn out to the one end of arbor, pass through belt transmission between the self -corresponding band pulley of two motors and each, on the connecting rod of motor vertical fixation between frame and base, reserve space settings subsieve fraction conveyer belt between motor and arbor, and then rationally arrange the spatial position between arbor and the motor, on the basis of guaranteeing power transmission between motor and the arbor, the whole required installation space of breaker has been reduced, simultaneously with the homonymy of drive disk assembly setting at the arbor, still be convenient for drive part's fault finding and maintenance.