The utility model discloses a double -geared drive system that is arranged in on -board to move expert, include driving motor, action wheel, follow driving wheel, U type arm, second grade drive disk assembly, one -level eccentric mounting parts and second grade eccentric mounting parts, driving motor with the action wheel passes through one -level eccentric mounting part with U type arm fixed connection, the second grade drive disk assembly passes through second grade eccentric mounting part with U type arm fixed connection, the action wheel with pass through from the driving wheel the transmission of second grade drive disk assembly, the utility model discloses a double -geared drive system that is arranged in on -board to move expert can effectually reduce from the size of driving wheel through at the action wheel with from adding the second grade drive disk assembly between the driving wheel to the effectual weight that reduces equipment, can adopt simultaneously conventional step motor to drive, need not use the motor of taking the speed reducer, can reduce the cost.