Geological surveying instrument support leg suitable for various terrains

The geological surveying instrument support leg suitable for the various terrains comprises a top plate, a main rod, an inner rod and a bottom cylinder, the outer wall of the bottom of the top plate is fixedly connected with a plurality of clamping plates distributed at equal intervals, and rotating shafts are rotationally connected between the inner walls of the opposite ends of the clamping plates through bearings; the outer walls of the tops of the multiple main rods are fixedly connected to the circumferential outer wall of the rotating shaft, inner grooves are formed in the outer walls of the bottoms of the main rods, the inner rods are inserted between the inner walls of the peripheries of the inner grooves, fastening mechanisms are arranged on the outer walls of the peripheries of the bottoms of the main rods, and a top groove is formed in the outer wall of the top of the bottom cylinder. The outer wall of the bottom of the inner rod is inserted between the inner walls of the periphery of the top groov