Compared with traditional stone cutting technology, the diamond wire saw cutting technology is more efficient, safer and less polluting. Therefore, wire saw technology is more and more widely used in stone mining and other fields. However, the existing wire sawing machine must ensure the tension of the string bead wire at all time during the cutting process. Therefore, after cutting for a period of time, the wire breaking work must be performed, which greatly reduces the engineering efficiency, so this paper introduces a new automatic adjustment device of a diamond wire saw. Firstly, the overall structural design of the diamond wire saw is introduced. Secondly, the mechanical structure and sensing control of the automatic adjusting device of the diamond wire saw are introduced in detail. On the basis of the original wire saw, an adjustable wheel that can be automatically moved is added, and the working pressure of the string bead wire is measured in real time by a pressure sensor, the back and forth movement of the adjusting wheel can be controlled to drive the stretching of the string bead wire, thereby realizing the automatic tensioning of the string bead wire; Finally, working parameters of the wire saw are transmitted by Bluetooth or other wireless communications to achieve remote control operation of the wire saw. Through the innovative and optimized design of the automatic adjustment system for string bead wires of the wire saw, it provides a good reference for the high-efficiency, low-cost and environmentally-friendly quarrying technology.