The transmission lines in mountainous areas have evolved through mechanization, automation, and intelligence. From the perspectives of structural features and functions, a modular design was applied to the selection and integration of the main components of the micro-pile drilling machine. This design meets the requirements for miniaturized, lightweight, and modular construction equipment for micro-pile tower foundations in mountainous areas. Finite element method simulations were conducted on the rock-breaking process of the drill bit, aiming to find the optimal impact and rotation speeds. The results indicated that with an impact speed of 7.0 m/s and a rotation speed of 10 r/min, the bit's penetration displacement increased by 21.3%, while the peak impact reaction force only rose by 34.2%. Developing a modular, detachable micro-pile drilling machine suitable for mountainous transmission line foundations provides a valuable reference for the intelligent development of transmission lines in such regions.