The present invention relates to a hot water generation device using waste heat from a cold air dryer. The hot water generation device using waste heat from a cold air dryer includes: a drying chamber which stores a drying target, receives air, and discharges the air； a compressor compressing a refrigerant in the form of low-temperature and low-pressure air to be in the form of high-temperature and high-pressure air； a condenser for condensing the refrigerant supplied from the compressor； an expansion valve reducing the pressure of the refrigerant supplied from the condenser； a dehumidifying coil which is installed in the dryer and exchanges heat between the refrigerant supplied from the expansion valve with air in the drying chamber to evaporate the refrigerant； a heating coil which is installed in the drying chamber and exchanges heat between the refrigerant supplied from the compressor and air in the drying chamber to heat the refrigerant； a multi-stage heat exchanger which receives the refrigerant bypassing the condenser from the compressor and supplies the refrigerant to the expansion valve； and a hot water tank which heats and stores the hot water, circulated and supplied through a hot water circulation line of the multi-stage heat exchanger by pumping pressure from a hot water pump, by using the heat exchange operation with the refrigerant and supplying the hot water on the inside to a consumption end through a water supply line for use. According to the present invention, the hot water generation device has a simple structure, enhances drying efficiency, and provides a drying function and hot water providing function, thereby also serving as an instant hot water supplier. The hot water generation device has a compact size while having various functions to enhance space utilization, uses the condensed waste heat to generate hot water, and boosts energy recycling and cost efficiency.본 발명은 피건조물이 수용되고, 공기가 공급되어 배출되는 건조실； 냉매를 저온저압 기체에서 고온고압 기체로 압축시키는 압축기； 상기 압축기로
