Abstract: A foldable bicycle includes a bicycle frame, two driving wheels and a folding arrangement. The bicycle frame has a front portion, a rear portion, and a body frame including three supporting members to define a triangular structure. The folding arrangement includes a folding joint and a detachable connecting joint. The folding joint is provided at one of the supporting members to pivotally connect the front portion of the bicycle frame with the rear portion thereof. The detachable connecting joint is provided at another of the supporting member to disengage the triangular structure of the body frame, such that the front portion of the bicycle frame is adapted to pivotally fold towards the rear portion thereof via the folding joint to overlap the two driving wheels so as to fold up the foldable bicycle to a compact structure.