The invention relates to an electronic safety protection method and a private network guardrail for high-voltage tests of an electric power system, which belongs to the technical field of high-voltage tests of the electric power system. The technical scheme is that a plurality of sensing nodes and a central controller are positioned on an edge line of a field of the power supply high-voltage tests, the plurality of sensing nodes are connected through a wireless network, the plurality of sensing nodes and the central controller are connected through the wireless network, and a wireless sensingnetwork is formed. If staff is monitored to approach to the field of the power supply high-voltage tests, acousto-optic alarm signals are sent out. If staff is monitored to approach to the field of the power supply high-voltage tests, a power supply for the power supply high-voltage tests is timely cut off to avoid accidents. The electronic safety protection method and the private network guardrail for high-voltage tests of the electric power system have the advantages that the wireless sensing network is applied to detection of human invasion and used in the field of the power supply high-voltage tests to guarantee safety and avoid accidents; the number of the sensing nodes can be randomly increased and decreased according to need; and data transmission paths between the sensing nodes can be optimized intelligently according to actual situations to guarantee efficiency and reliability of transmission.