Height adjustable support of steel-tube back shore

The utility model discloses a height adjustable support of a steel-tube back shore comprising a base, a screw rod, a handle, a nut, a gasket and a locking bolt. The screw rod is vertically connected with the base horizontally put. The length of the screw rod is 200 mm to 400 mm, the outer diameter is as small as 1mm to 5mm than the inner diameter of a matched steel-tube back shore. The nut rotates opposite to the screw rod to form an axial lifting mechanism. A radial opened groove is arranged at one side of the nut, and the locking bolt is connected with the radial opened groove to from a locking mechanism. The gasket is arranged at the nut facing the upper end for supporting the steel-tube back shore, and the handle making manual adjustment is arranged at the side. The height adjustable support of a steel-tube back shore and the steel-tube back shore are vertically put below a template together, and the steel-tube back shore is precisely adjusted to a set height by rotating the nut. Because of the axial lifting mechanism, the length size precision need of the matched steel-tube back shore is low. The most important is that the height adjustable support of a steel-tube back shore and the steel-tube back shore are in a split structure thereby having the advantages of small volume, light self weight, convenient moving and low cost, and the utility model is suitable to use with steel-tube back shores with different heights.