The invention relates to a telescopic steering wheel for a child's bicycle. The telescopic steering wheel comprises a steering wheel body, a telescopic sleeve device and a limiting gland. The telescopic sleeve device is fixed in a sleeve hole of a bicycle head lower cover, and the telescopic sleeve device comprises an inner sleeve, an outer sleeve and a reducing sleeve; the steering wheel body is fixed to the top end of the inner sleeve, the inner sleeve is sleeved with the outer sleeve, and the reducing sleeve is located at the bottom end of the outer sleeve and used for being connected to a steering mechanism at the bottom of the bicycle; a sleeve adjusting mechanism is arranged between the inner sleeve and the outer sleeve. Compared with the prior art, the inner sleeve and the outer sleeve are arranged, the relative positions of the inner sleeve and the outer sleeve are adjusted through the sleeve adjusting mechanism, the structure is simple, and the steering wheel body can be conveniently mounted and demounted; the steering wheel body is fixed to the top end of the inner sleeve, the vertical moving distance between the inner sleeve and the outer sleeve is adjusted through the sleeve adjusting mechanism, the telescopic steering wheel is suitable for being operated by children with different heights in different age groups, and the practical performance is improved.