The utility model discloses a device preventing switching-on when a ground wire is not removed. The device comprises a base, and the base is provided with an insertion hole. The insertion hole is provided with a trigger switch inside. The base is provided with a wireless signal emitter and a power supply. The power supply is connected with the wireless signal emitter through the trigger switch. The wireless signal emitter is connected with a wireless signal receiver in a control room. The wireless signal receiver is provided with indicator lamps. Through arranging the insertion hole which is a through-hole in the base, and arranging the trigger switch on an inner side of the through-hole, when a grounding steel chisel is inserted, clearance between the steel chisel and the through-hole becomes small, so that the trigger switch is opened by pressure, and the wireless signal emitter sends a connection signal to the wireless signal receiver in the control room, and current state is displayed by the indicator lamps. The device greatly ensures safe and stable operation of a power grid and electrical equipment. The device is simple in structure, and is safe and reliable, and is worthy of wide popularization and application.