A transformer substation outdoor cabinet intelligent fully-automatic moisture remover comprises a capacity-increase box hoisted on a bottom surface of a CT junction box. The capacity-increase box is abox body structure with an open top surface and a capacity-increase box door on a front surface. The capacity-increase box is provided with a horizontally-arranged diversion separation plate, and thetwo ends of the diversion separation plate are installed on two side plates of the capacity-increase box. The diversion separation plate divides an internal space of the capacity-increase box into upper and lower spaces. The two sides of the diversion separation plate are arranged with the capacity-increase box door of the capacity-increase box and a back plate at intervals. The diversion separation plate is provided with a diversion fan with an upward wind direction, and a position of one side plate of the capacity-increase box, which corresponds to the lower space, is provided with an exhaust fan whose wind direction faces towards the outside world. A capacity-increase box controller is arranged on the diversion separation plate. The capacity-increase box controller is electrically connected to the diversion fan and the exhaust fan. A humidity sensor is arranged on the bottom plate of the capacity-increase box, and the humidity sensor is electrically connected to the capacity-increase box controller. A battery box is hoisted on the bottom surface of the capacity-increase box, a storage battery is installed in the battery box, and the storage battery provides power for the diversion fan and the exhaust fan. The moisture remover is suitable for a transformer substation outdoor cabinet.