Abstract: The present invention relates to a dehumidification system for a vehicle, which is developed to remove humidity from the vehicle interior through a separate path from an air-conditioner or a cooling system, installed in the existing vehicle. An air-conditioning system for the vehicle has a circulation path in which an inner refrigerant passes through an evaporator with a blower fan blowing air into the interior of the vehicle from a condenser via an expansion valve, and the inner refrigerant is returned to the condenser by a compressor. The dehumidification system for the vehicle comprises a water jacket, a heat-exchanger, and a circulation conduit. The water jacket with a conduit which is extended therein for heat absorption is positioned close to the vehicle engine to absorb the heat thereof. The heat-exchanger is located on the path in which the vehicle's interior air is circulated and cooled by the blower fan and removes the humidity by condensing the surrounding air.