The utility model discloses an adjustable base for a bridge member, and provides an experimental system with a novel structure. Including a substrate, the chute structure is positioned on the front surface of the substrate; the vertical adjusting mechanism is positioned in the strip-shaped hole I above the base plate; the sliding groove structure comprises an upper sliding way and a lower slidingway, the lower sliding way is parallel to the upper sliding way, the length of the lower sliding way is larger than that of the upper sliding way, and fasteners for fixing the ends of the hydraulic cylinder are arranged on the upper sliding way and the lower sliding way respectively. According to the utility model, the base can be conveniently installed and adjusted so as to meet the experimentalrequirements of large-tonnage bridge concrete members, and the vertical height and the position of the base can be conveniently and accurately adjusted in cooperation with the hoisting of a crane.