The utility model discloses an assembled safety protection that field usage overhauld in power plant and transformer substation hides fence, including the stand support, the stereoplasm blocks and thecone structure, be provided with the reflective membrane on the stand support, and has seted up the mounting groove to the side of the stand support, the mounting groove internally mounted who sets up on the stand support has the stereoplasm to block, and the fixed penetrating hole who sets up on the stand support through fixing bolt and stereoplasm block set up to block the mounting hole installation together fixed, the stereoplasm blocks the top and is fixed with safety warning board. This assembled safety protection that field usage overhauld in power plant and transformer substation hidesfence, the warning effect can be realized to the alternate reflective membrane of design on the support under the not enough light environment, the underground portion adopts the cone design, light in weight, intensity height, simple to operate can effectively guarantee operator person's safety and reduce and arrange safety measure work load, has improved work efficiency, is worth popularizing and applying in national electric power enterprise, transformer substation.