Abstract: A folding bicycle includes a frame, a steering unit, a shaft tube coupled to a first end of the frame and to the steering unit, a front fork linked with the steering unit through the shaft tube, a front wheel mounted onto the front fork, a rear fork coupled to a second end of the frame, a rear wheel mounted onto the rear fork, and a seat unit installed onto the frame. A folding unit is installed at a central position of the frame, and the first and second ends of the frame include a first pivot and a second pivot respectively, such that if the frame is folded by means of the folding unit, the first and second pivots are stacked with each other to achieve the effect of reducing the folding volume of the bicycle.