The invention provides a thread scrap filter structure, a washing and drying integrated machine and a control method. The thread scrap filter structure is used for filtering thread scraps in air and comprises a shell provided with a filter screen therein; the two sides of the filter screen of the shell are provided with a wind inlet and a wind outlet; the filter screen is made of Teflon material or the surface of the filter screen is sprayed with a Teflon layer to reduce the adhesive force of thread scraps. The thread scrap filter structure is additionally provided with a flushing mechanism used for flushing thread scraps attached to the filter screen, so that the step of manual cleaning is saved; an electric cleaning brush used for cleaning the filter screen can be arranged in the shell to reinforce the flushing effect. The washing and drying integrated machine is characterized in that an air outlet of an outer drum is provided with the thread scrap filter structure, so that thread scraps are prevented from entering a circular wind duct and a heat exchanger at the very beginning, the service life of the wind duct is prolonged and the clothes drying efficiency is increased; the thread scraps can be flushed automatically in the clothes drying process or after the clothes drying process, and thus the automatic cleaning capability of the washing and drying integrated machine is improved.