Chair capable of regulating height

Disclosed is a chair capable of regulating height, comprising supporting legs connected with the chair main body. The supporting legs are an upper supporting leg and a lower supporting leg mutually sleeve jointed together; the supporting legs are of hollow structure; a lifting adjusting device is arranged in the supporting legs. The lifting adjusting device comprises two link mechanisms equipped in the upper supporting leg, wherein, one end of the vertical link is connected with an extension spring, and the middle part of the cross link is arranged on a position pin; when the cross link is in horizontal state, its end part passes through the side faces of the upper supporting leg and the lower supporting leg. The utility model equips the two link mechanisms used for regulating height in the hollow supporting legs; the extended position of the end part of the cross link in the lower supporting leg is regulated through a pulled handle equipped in a regulating slid slot, so that the height of the entire chair is regulated. The inner side edge of a clamping hook of the cross link is contacted on the outer side surface of the lower supporting leg and a positioning bolt equipped on the lower supporting leg used for reinforcing connection, which greatly reinforces the connection strength between the uppersupporting leg and the lower supporting leg.