The utility model discloses a modular drilling machine system for electric power iron tower foundation punching construction. The drilling machine comprises a drill boom assembly module, an oil tank cooling module, a power control module, a power module, an air compressor module and an operation table module which are arranged in a split mode. The drill boom assembly module comprises a drill boomassembly frame, a power head which is mounted on the drill boom assembly frame and can move up and down along the propelling beam, and a drill rod connected with the power head; the number of the power modules is four. The air compressor module is provided with two air compressors; the two power modules suck oil from one oil tank cooling module through an oil suction pipe; the two power modules output high-pressure oil and then are combined into one path, one air compressor in the air compressor module is driven through a high-pressure oil pipe, return oil of the air compressor returns to theoil tank cooling module through an oil return pipe, and high-pressure gas output by the air compressor passes through the operation table module through an air pipe to reach the power head to drive the power head to work. According to the utility model, manual carrying to a mountainous region construction area is facilitated, and then assembling is carried out.