The tunnel drilling rig used in coal mines is of an integral box structure, with small volume, light weight, convenient movement, and easy handling and installation in small cross-section tunnels. The transmission method adopts mechanical rotation, hydraulic feeding, and hydraulic chuck, with a compact structure and high efficiency. Replace some parts, which can be used φ 50 and φ 42 drill pipe. The drilling rig system is simple, easy to operate, and has advantages in drilling capacity, drilling efficiency, safety and reliability.