A transverse drilling device for a steel ground pile is characterized by comprising a hook, an adjusting pull rod seat and an aircraft drill, the hook is a bent hook formed by bending a section of deformed steel bar and can hook a photovoltaic support steel stand column, the adjusting pull rod seat is a section of flat steel welded to the long end of the hook, three seat holes are drilled in the adjusting pull rod seat to be in clearance fit with a handle of the aircraft drill, and a drill bit is convenient to adjust. According to the utility model, the adjusting pull rod seat and the hook areadditionally arranged on the airplane drill handle; the device is simple in structure and convenient to use, is hooked on a photovoltaic support steel pipe to be punched, enables the direction of force to be changed, and is pressed downwards to increase the pushing force, thereby achieving the effect of drilling through the pipe wall, improving the working efficiency, the drilling quality and theinstallation progress, saving manpower, material resources and financial resources and shortening the construction period.