The utility model relates to a take one -way manual speed increase unit that ratchet gear wheel can commutate, including installing support, apron, driving gear, driven gear, ratchet gear wheel, be equipped with the crank on the driving gear, driven gear is last to be equipped with square sleeve, is equipped with the poker rod that can change ratchet gear wheel and initiative gear engagement position on the ratchet gear wheel, is equipped with on the installing support and compresses tightly the spacing spring catch subassembly on the driving gear with the ratchet gear wheel, the utility model discloses an advantage: set up through the meshing transmission of ratchet gear wheel with the driving gear, can only be at the folk prescription to the rotation when making the driving gear operation, and can change ratchet gear wheel and initiative gear engagement position through the poker rod, thereby change the rotation direction of driving gear, overall structure is simply small and exquisite, convenient use and reliability, can effectively save the operating time who needs the operation components and parts, the operation efficiency is improved, and compress tightly the ratchet gear wheel on the driving gear through spacing spring catch subassembly, the effectual not hard up phenomenon of during operation ratchet gear wheel of having avoided.