The invention relates to the technical field of electrical equipment, in particular to a dampproof electrical cabinet. The dampproof electrical cabinet comprises a cabinet body and a dampproof system,an upper component room, an equipment room and a lower component room are arranged in the cabinet body, and the dampproof system comprises an air inlet pipe, a first drying filter, a heater, a fan, an air sharing disc, an air suction disc and an air outlet pipe. In the dampproof electrical cabinet, air is introduced by the fan, is dried by an effect of the first drying filter and is filtered, theair is heated, warmed and dried by the heater, is uniformly sprayed out of ventilation holes of the air sharing disc and flows to the equipment room, air in the equipment room is replaced, the replaced air is discharged to an environment by the air outlet pipe, so that original air with relatively large humidity in the equipment room is replaced by the dried and filtered air, a component in the equipment room is effectively prevented from being affected with damp and damaged, the safety of the equipment is improved, and the service lifetime of the equipment is prolonged.