The utility model discloses a novel underground excavation supporting structure, comprising a base plate, the upper end of bottom plate is fixed with the sleeve, be equipped with the mounting groove on the sleeve, run through being equipped with first spiral shell rasp bar on the sleeve, in just first spiral shell rasp bar's one end runs through the sleeve and extends to the mounting groove, firstspiral shell rasp bar's one end is rotated on the one end lateral wall of connecting in the mounting groove, the second gear has been cup jointed on the first spiral shell rasp bar, first spiral shell rasp bar's both ends are equipped with reverse screw thread respectively. The utility model discloses a to the regulation of fender pile height with fixed, conveniently adjust, carry out more effective strutting to the horizontal plate, solved because surface subsidence or construction and other reasons, often make the highly unified of supporting pile, can't carry out effectual strutting, increased the risk, result in can not the be safely quick scheduling problem of constructing, safe convenient, convenient construction, simple structure conveniently operates, suitable popularization.