Height adjustment mechanism of supporting rod

The utility model discloses a height adjustment mechanism of a supporting rod. The supporting rod comprises a hollow cylinder, a rod body which is arranged in the cylinder and a height adjustment mechanism body in an inserting mode. The top of the cylinder is connected with a limiting seat which is matched with the rod body in a sleeved mode. A containing cavity is formed inside the limiting seat. A button is arranged in the containing cavity of the limiting seat. A button hole which is mutually communicated with the containing cavity is formed in the outer edge face of the limiting seat, wherein the button hole is convenient for the pressing end of the button to stretch out. In the containing cavity, the back side of the pressing end of the button is further connected with a reset spring which facilitates reset of the pressing end of the button in a pressing mode. Clamping teeth which stretch inside the cylinder are arranged at the bottom of the button in an expanding mode, and a plurality of clamping tooth