The invention relates to a mountain cutting and rock drilling tunnel stone splitting machine, belongs to the technical field of stone splitting machines, and provides the mountain cutting and rock drilling tunnel stone splitting machine which solves the problems that field working is lack of electricity and power and is capable of achieving mechanical-electrical-hydraulic integration and saving manpower, high in efficiency, safe and environmentally friendly. The mountain cutting and rock drilling tunnel stone splitting machine comprises a chassis, a big arm, a small arm, a main machine body and a hydraulic system; the chassis, the big arm and the small arm are rotatably connected in sequence, and the small arm is connected with the main machine body through an angle adjusting device; the main machine body comprises three pushing oil cylinder sets, a gear case, a drill rod, a drill bit, splitting devices and a pushing slideway, the first pushing oil cylinder set is connected with the gear case through a universal coupling, the second pushing oil cylinder set and the third pushing oil cylinder set are each connected with the corresponding splitting device through a universal coupling, and the hydraulic system comprises a hydraulic motor, two overflow valves, six magnetic exchange valves, a high-pressure oil pump and a pressure meter. The mountain cutting and rock drilling tunnel stone splitting machine is mainly applied to the mountain cutting and rock drilling tunnel aspect.