Flip flow screen is mainly used for screening water, mud, loose viscous materials, as well as a variety of difficult to screen materials, the screen is made of retractable polyurethane and other materials. When the screen is stretched, the screen is stretched and loosened repeatedly and alternately, so that the material has a bouncing forward movement on the screen surface, and the material is screened to avoid the material sticking to the screen and blocking the screen hole.