Height-variable balance wheel

The utility model relates to a height-variable balance wheel, which comprises a supporting assembly, a connecting assembly and a roller which are sequentially arranged from top to bottom, the supporting assembly comprises a supporting plate, an adjusting bolt and a main shaft, the supporting plate is connected with the top end of the main shaft, and the main shaft is provided with a through hole for the adjusting bolt to penetrate through. The adjusting bolt is arranged on the main shaft in a penetrating mode, the connecting assembly comprises a supporting foot, a supporting shaft and a rotating shaft, the supporting shaft and the rotating shaft are arranged on the supporting foot in a penetrating mode, one end of the bolt abuts against the peripheral side surface of the supporting shaft, the supporting foot is connected with the rolling wheel, and the supporting foot can rotate around the center shaft. Compared with the prior art, the height adjusting device has the advantages of being adjustable in height,