The present invention relates to a convertible child cycle, which includes a cycle frame extending in a horizontal longitudinal direction and curved upwardly. The cycle frame is formed with a slot facing downward. The cycle frame is further formed with a first installation connector adjacent to the front end, a second installation connector adjacent to the rear end, and a third installation connector disposed between the first and second installation connectors. The child cycle further includes a headset assembly and a rear fork assembly releasably engaged the first and the second installation connectors, respectively. With the growth of a preschool child rider, the invention may be readily converted into a tricycle, a balance bicycle or a bicycle by combining the cycle frame with various accessory parts, thereby satisfying the recreation needs of the preschool child at different developmental stages.