Preparation method for wash-fast and spongy moisture-absorbing quick-dry finishing agent

The invention discloses a preparation method for a wash-fast and spongy moisture-absorbing quick-dry finishing agent. A product of the finishing agent adopts new raw materials of DMT and PEG, and a catalyst and an anti-oxidant are cooperatively used, cost of the product is greatly reduced, great production cost is saved for follow-up using of a printing and dyeing factory, and processing competitive advantage of the printing and dyeing factory is increased. The product is capable of cutting in cold water, less in foam, high-temperature-resistant, dyeing and co-bathing with dacron, in comply with technical requirements of energy conservation and emission reduction, and capable of reducing a pressure of an enterprise to environmental protection. Washable frequency of the product is up to more than 30 times, a washable problem of sportswear fabric for ordinary household is completely solved, and good hydrophilic and quick-dry functions can be still achieved after 30 times. The product hasgood fluffy and soft han