The invention provides a liquid crystal display device and a gate driving circuit voltage control method and control circuit thereof. The control method comprises the following steps of: detecting that a boost voltage of a boosted circuit connected with a gate driving circuit is reduced to a preset value when the liquid crystal display device is shut down, and starting a control circuit connected with the gate driving circuit; and controlling the gate driving circuit to open all grid lines when detecting that a voltage signal output by the control circuit is reduced to 0V, so that electric charges generated by the grid lines neutralize all the electric charges in pixels. According to the scheme, the phenomenon that the low-speed charging (discharging) or a white screen of the liquid crystal display device is caused by startup or shutdown can be avoided.