The invention relates to a fence door safety system for field electrical test and an operation method thereof, and belongs to the technical field of electrical test safety equipment. According to thetechnical scheme, a door frame (2) is provided with a power switch (6), a power indicator (7) and a stroke switch (8); a push rod (5) of the stroke switch is positioned on the upper side of a door baffle (3); a fence door (4) is matched with the push rod on the door baffle (3); a power cable (15) is divided into a main loop and a control loop; the control loop is divided into two paths after passing through the power switch (6); one path is connected with an alternating-current contactor coil (16) through the stroke switch (8); the other path is connected with the power indicator (7) through acontactor normally-open contact (18); and the main loop is connected with test equipment (14) through a contactor power switch (17). Through adoption of the fence door safety system, the electrical test can be performed safely in order, so that wiring staff and other irrelevant staff can be effectively isolated from electrical test equipment, and the field safety of high-voltage test operation isensured.