The invention relates to an intelligent moisture dispeller for a secondary circuit of substation GIS equipment, which comprises a capacity increasing box, and is characterized in that the capacity increasing box is internally provided with a flow guide partition plate for dividing the internal space into an upper space and a lower space, and two sides of the flow guide partition plate are respectively arranged at intervals with a box door and a back plate of the capacity increasing box; the flow guide partition plate is provided with a flow guide fan with an upward wind direction, one side plate of the capacity increasing box is provided with an exhaust fan with an outward wind direction at the position corresponding to the lower space; the flow guide partition plate is provided with a capacity increasing box controller electrically connected with the flow guide fan and the exhaust fan; a bottom plate of the capacity increasing box is provided with a humidity sensor electrically connected with the capacity increasing box controller; the inner surface of the capacity increasing box is provided with an insulating heat-insulating plate; one outer surface of a ventilation box is provided with a snap fastener male surface or a snap fastener female surface, the insulating heat-insulating plate is provided with a snap fastener female surface or a snap fastener male surface, and the ventilation box is adhered to the insulating heat-insulating plate through the snap fastener male surface and the snap fastener female surface; and a battery box is hung on the bottom surface of the capacity increasing box, and a storage battery is arranged in the battery box and supplies power to the flow guide fan and the exhaust fan. The intelligent moisture dispeller is suitable for GIS equipment.