The utility model discloses a 500kV transformer station voltage control checking device, and relates to a checking apparatus. In the prior art, a condition that a combined voltage regulation manner through the combination of other transformer stations and power plants is needed and a condition that an independent voltage regulation manner only through the transformer station is needed cannot be distinguished during the operation, and voltage regulation can be carried out by mistakes or voltage regulation effects cannot be achieved under a whole system combined voltage regulation condition. The checking device comprises a housing, a microprocessor disposed inside the housing, a control mode selection device, a communication device, a control interface, a display device, an input device, a parameter configuration device and a power supply. The microprocessor is connected to the control mode selection device, the communication device, the control interface, the display device and the parameter configuration device. The control mode selection device comprises a control mode indicating lamp and a control mode selection button. The control mode indicating lamp and the control mode selection button are connected to the microprocessor through a GPIO. By employing the scheme mentioned above, practical problems that the voltage regulation can be carried out by mistakes or the voltage regulation effects cannot be achieved under a combined voltage regulation condition by the VQC can be avoided.