PURPOSE: To prevent occurrence of unevenness of dyeing or surface ruggedness of a fabric due to dew condensation by heating and introducing the outside air and discharging water to the outside before applying a high-temperature and high-pressure treatment to a rope-shaped textile product in a circulatory treatment passage and preventing dew condensation.

CONSTITUTION: In an air-current type treatment apparatus for circulating and treating a rope-shaped textile product of a fabric, etc., the above textile product 7 is subjected to a high-temperature and high-pressure treatment such as dyeing while being rubbed by a circulatory treatment passage 1 composed of a header unit 2 involving a drive reel or roll 3 incorporated therein, a transfer pipe 5 having a treatment fluid injection part 4 and a residential tank 6 and an air-current circulatory passage 9 for allowing gas discharged from the residential tank 6 to pass through a filter 10, blowing out it through a blower 11, heating it through a heat exchanger 12, injecting it through the injection unit 4 into the transfer pipe 5, discharging it from the residential tank 6 again and circulating it. Before starting the high-temperature and high-pressure treatment, the outside air taken from an outside air inlet part 13 is heated and introduced through the heat exchanger 12 so as to remove water from the textile product 7. The inner wall surfaces of the treatment apparatus are heated and dried at the same time and water is discharged through an exhaust unit 14 so as to prevented dew condensation.