Ultra-fine yarn heating device

The invention relates to an ultra-fine yarn heating device. The ultra-fine yarn heating device comprises a housing, a conveying part used for conveying yarn into and out from the housing, a hot wind inlet which is arranged on the upper part of the housing and is used for inputting heat source, and a pedestal body which is arranged in the housing and is used for covering ultra-fine yarn; the wall of the pedestal body is provided with diversion holes, the diversion holes are uniformly distributed on the wall of the pedestal body, and the pedestal body shapes like a cylinder. The above structure is adopted, so that quality of ultra-fine yarn can be ensured.