The utility model relates to a dehumidification prevention waterlogging system of electric substation, including the water tank, the niloscope that is arranged in detecting the water tank middle water level that set up in the electric substation low level department, be arranged in with the water level of water pump to the electric substation outside of the water pump drainage of water tank, the water tank that detects according to the niloscope produce control signal control terminal, to the water pump transmit control signal and to control terminal feed back the operating condition of water pump the controller, set up in each transformer cabinet and discharge to the dehumidifier of water tank after with the moisture condensation in the transformer cabinet. The utility model discloses can efficient handling transformer cabinet inside humidity problem and the electric substation solves in the ponding problem, and can realize that automatic controls to can improve equipment reliability and security, reduce electric substation's ponding or too high equipment trouble who brings of transformer cabinet humidity and economic loss, to the electric substation and wherein the operation management of equipment is significant.