Geological fracture measuring device

The utility model discloses a geological crack measuring device, and belongs to the technical field of crack measuring tools, the geological crack measuring device comprises a measuring assembly, a splicing assembly and two groups of supporting assemblies, the measuring assembly comprises a plurality of measuring rulers and two measuring blocks, the splicing assembly comprises a plurality of splicing pieces, two splicing bolts penetrate through the splicing pieces, and the splicing pieces are connected with the measuring rulers and the two measuring blocks. Splicing grooves are formed in the two sides of the top and the two sides of the bottom of the measuring scale, the side edge, close to the measuring scale, of each splicing groove is of an open hole type, a first threaded groove is formed in the inner wall of each splicing groove, and the splicing pieces are matched with the splicing grooves. The two measuring rulers are aligned, then the splicing pieces are placed in the splicing grooves in the adjacent