A thread debris filtering apparatus includes a thread debris filter, where the thread debris filter includes a filter front cover (100) and a filter rear cover (200) connected with the filter front cover; a water filtering part (110) is arranged on the filter front cover (100); a water inlet (220) is arranged in the filter rear cover (200); backflow prevention structures (210) are arranged on an inner wall of the filter rear cover (200); and the backflow prevention structures (210) are arranged at the lower part of the water inlet (220) and close to the water inlet (220).