Bicycle with adjustable rear-wheel spacing

The utility model relates to a bicycle with an adjustable rear-wheel spacing. The bicycle comprises a front wheel, a bicycle head, a seat, pedal plates and rear wheels. The bicycle is characterized in that the rear part of a bicycle body (1) is provided with the two parallel rear wheels (2), and a movable telescopic rear shaft (3) is arranged between the two parallel rear wheels (2); one of the two parallel rear wheels (2) can be removed from the bicycle body (1). The bicycle has the advantages that aiming at the defect of poor safety and stability of the enlightened bicycle of common children, the traditional directional wheel structure is changed, and is directly transitioned from a four-wheel mode or a three-wheel mode into a two-wheel mode; by adjustment of the spacing between the rear wheels, the children can master the balancing capability of the bicycle gradually, and master the use of the two-wheel bicycle, so that the potential safety hazards of the children in the process of learning the bicycle is