Drilling rig with adjusting structure for road and bridge investigation and design

The invention relates to the technical field of road and bridge investigation, in particular to a drilling rig with an adjusting structure for road and bridge investigation design, the drilling rig comprises a base and four positioning holes, the base is concave, the four positioning holes are uniformly distributed in the base, and a placing groove is formed in the rear side wall of the base. By arranging the annular shell, the annular plate, the flat plate, the bottom plate, the drilling main machine and the rotary driving assembly, the bottom plate can be pushed according to the actual drilling position and angle requirements during use, the bottom plate drives the fixing plate to rotate through the flat plate, and the fixing plate drives the annular plate to rotate in the annular shell; the angle of the drilling main machine can be adjusted through the angle adjusting assembly, positioning between the annular plate and the annular shell is achieved through operation of the angle positioning assembly, drill