The invention relates to a substation intelligent electrical equipment dehumidifying apparatus. The dehumidifying apparatus is arranged in a box body of indoor or outdoor electrical equipment and includes a thermoelectric semiconductor component, the thermoelectric semiconductor component is provided with a plurality of semiconductor refrigeration sheets employing the Peltier effect, air in the box body is transmitted near the semiconductor refrigeration sheets through a ventilation pipeline in the dehumidifying apparatus, and the semiconductor refrigeration sheets are powered on to enable moisture in the nearby air to form water droplets at cold ends of the semiconductor refrigeration sheets through condensation and to enable the droplets to be discharged to the external part of the box body through a guide pipe. According to the apparatus, by employing a thermoelectric semiconductor with high thermoelectric conversion efficiency, the size is small, the dehumidifying efficiency is high, the reduction of the insulation level of the equipment due to condensation generated on the insulation surface of the equipment and attachment of dirt can be effectively prevented, and creepage andflashover accidents caused by condensation in a cabinet can be avoided.