The utility model discloses a telescopic bicycle, including the car roof beam, the car liangyou slides and cup joints first car pole, second car pole and third car pole, and the axis of rotation has been assigned in the one end rotation of first car pole, and axis of rotation upper portion is rotated and is equipped with the handlebar together, the fixed front fork rod that is equipped with in axis of rotation lower part, the front fork rod end is equipped with two at least preceding wheels, third car pole lower part is equipped with the stand, the rotatory axis that is equipped with on the stand, rear axle and two at least bearing wheels, the rear wheel has been cup jointed on two at least bearing wheels, in epaxial pedal gear and the crank of being equipped with, the terminal rotatory pedal that is equipped with of crank, be equipped with drive wheel corresponding with the rear wheel and the speed gearset corresponding with the pedal gear on the rear axle, when reducing this telescopic bicycle, only need the first car pole with the car roof beam, second car pole and third car pole are received together and to be transferred can to the saddle on with the handlebar, folding mechanism is simple, because the rear wheel can totally upright be placed with at least two preceding wheel cooperations, little space occupation.