Low temperature dryer

The present invention relates to a low temperature dryer which can dry the washing while preventing damage or deformation of the washing. The low temperature dryer, includes a drum unit 10 having a drum 11 in which the washing is contained, wherein the drum 11 rotates; a circulation duct 20 that communicates one side and the other side of the drum unit 10 ; a refrigerator 30 including an dehumidification evaporator 31 disposed at one side within the circulation duct 20 wherein the dehumidification evaporator 31 dehumidifies air passing through it, a compressor 32 for compressing a coolant via the dehumidification evaporator 31 , and a condenser 33 for discharging heat of the coolant via the compressor 32 ; a first heater 40 disposed at the other side within the circulation duct 20 , for heating air passing through it; a blowing fan 50 connected to the circulation duct 20 , wherein the blowing fan allows the air discharged from the drum unit 10 to pass through the dehumidification evaporator 31 and the first heater 40 and to be introduced into the drum unit 10 again; and a drain valve 60 for discharging the water dehumidified by the dehumidification evaporator 31 toward the outside.