A bicycle transmission hub comprising: a hub shaft to which a rotation force is input, the hub shaft having a plurality of first pawls (P1) arranged on the outer peripheral surface thereof; a transmission controller for controlling the appearing and disappearing of the first pawls (P1); a plurality of driving gears (21-24), each of which has a ratchet formed on the inner peripheral surface thereof to receive a rotation force transferred by the first pawls (P1), the driving gears (21-24) having a different number of teeth, the hub shaft extending through the center of each of the driving gears (21-24); a plurality of driven gears (31-34), which are engaged with the driving gears (21-24), respectively, have a different number of teeth, and rotate while being coupled to each other; an output wheel , which rotates while being coupled to a driving gear adjacent thereto among the driving gears (21-24) and has a second pawl (P2) disposed on the outer peripheral surface thereof; and a hub shell , which has a wheel spoke connected thereto and has a ratchet formed on the inner peripheral surface thereof to receive a rotation force transferred by the second pawl (P2), characterized in that the transmission controller includes: a wire or chain for transmission; an outer ring for rotating by the wire or chain; an inner ring provided inside the outer ring so as to move forward and backward by the rotation of the outer ring ; and a lever for enabling the first pawls (P1) to appear and disappear by the forward and backward movement of the inner ring , wherein the outer ring has a guide hole formed diagonally with respect to the circumferential direction in the outer peripheral surface, and the inner ring has a guide pin , which is protruded and confined in the guide hole . a hub shaft to which a rotation force is input, the hub shaft having a plurality of first pawls (P1) arranged on the outer peripheral surface thereof; a transmission controller for controlling the appearing and disappearing of the first pawls (P1); a plurality of driving gears (21-24), each of which has a ratchet formed on the inner peripheral surface thereof to receive a rotation force transferred by the first pawls (P1), the driving gears (21-24) having a different number of teeth, the hub shaft extending through the center of each of the driving gears (21-24); a plurality of driven gears (31-34), which are engaged with the driving gears (21-24), respectively, have a different number of teeth, and rotate while being coupled to each other; an output wheel , which rotates while being coupled to a driving gear adjacent thereto among the driving gears (21-24) and has a second pawl (P2) disposed on the outer peripheral surface thereof; and a hub shell , which has a wheel spoke connected thereto and has a ratchet formed on the inner peripheral surface thereof to receive a rotation force transferred by the second pawl (P2), a wire or chain for transmission; an outer ring for rotating by the wire or chain; an inner ring provided inside the outer ring so as to move forward and backward by the rotation of the outer ring ; and a lever for enabling the first pawls (P1) to appear and disappear by the forward and backward movement of the inner ring , <EOS>