The utility model relates to a tower grounding resistance measurement device of disconnect ground downlead exempts from, its structure does, and the control unit connects power module and measures the protection circuit, and power module connects gradually contravariant variable frequency power supply and current injection point, current injection point junction current measuring circuit and shaft tower column foot, measure protection circuit connection voltage measurement circuit and current measurement circuit, current measurement circuit connection host sends module and host computer receiving module, host sends module and host computer receiving module junction current sensor, voltage measurement 0 connecting rod tata foot. The utility model discloses can reduce the on -the -spot wiring degree of difficulty of test, improve work efficiency, work brings advance test means for tower grounding resistance test, can greatly simplify hard work and the cable conductor housekeeping that the ground connection downlead need be removed in on -the -spot test in the past.