The invention discloses an intelligent early-warning control device for high-voltage test grounding. The intelligent early-warning control device comprises the components of a CPU controller, a grounding resistance measuring loop, a control loop, an LCD display, a keyboard, a JAT debugging interface and an auxiliary power transformer. The grounding resistance measuring loop, the control loop, the LCD display, the keyboard, the JAT debugging interface and the auxiliary power transformer are connected with the CPU controller. The input end of the auxiliary power transformer is connected with the output end of the auxiliary power transformer and the output end of an output power switch. The output end of the output power switch is connected with the input end of a power output through a leakage protector. The output end of the auxiliary power transformer is connected with the input end of an infrared transmission module, the input end of an infrared receiving module, the input end of a voice module, the input end of an alarm module and the input end of a flash module. The intelligent early-warning control device has functions of detecting a grounding resistance in a maintenance test in real time, safety switching on a testing power supply and ensuring reliable grounding in the maintenance test.