Abstract: In order to meet the requirements of tunnel drilling construction technology in Sichuan-Tibet Railway in China, reduce the labor intensity of operators and improve the drilling efficiency, the company independently developed a KYL-8/25D multi-function drilling rig, which solved the problems of short detection distance and low efficiency of existing drilling equipment in construction. Firstly, the three-dimensional model is established by SolidWorks, and the feasibility of the design is verified by introducing the function of each structure and simulating the drill pipe. The actual effect of the drilling rig is also verified by the debugging test, which provides the design basis and successful engineering examples for the tunnel construction of Sichuan-Tibet line.