The invention discloses a cable-stayed bridge inhaul cable intelligent dehumidifying and deicing system and method and relates to the field of bridge operation safety protection. The system comprisesan air feeding unit, a monitoring unit and a control unit. The air feeding unit comprises a high-pressure dry air production device and an air heating device. The high-pressure dry air production device is used for generating high-pressure dry air and driving the generated high-pressure dry air to pass through the air heating device, enter inhaul cables from the bottom ends of the inhaul cables and flow out from the top ends of the inhaul cables. The monitoring unit comprises humidity sensors and temperature sensors, all of which are arranged in the inhaul cables, and the monitoring unit further comprises humidity sensors, temperature sensors and icing sensors, all of which are arranged on the outer surface layers of the top ends of the inhaul cables. The control unit is electrically connected with the air feeding unit and the monitoring unit. The inhaul cables can be automatically dehumidified and deiced according to external climate changes, the inhaul cables are protected against corrosion, and meanwhile the inhaul cables are effectively prevented from being iced.