The flash dryer is widely used in the dispersion and drying of granular, powdery, paste-like and filter cake-like false agglomerates in the chemical, pharmaceutical, building materials, food, feed, and other industries. The flash dryer has the advantages of the small occupied area, low energy consumption, high thermal efficiency, and continuous mass production. The flash dryer body is provided with a rotary cutting device, and the dry material is subjected to shearing, rotating, collision, friction, etc., so that the material is pulverized and refined, and is highly dispersed, thereby achieving the effect of efficiently and rapidly evaporating water. The dryer is equipped with an air filter to achieve the cleanliness of the hot air and to provide production conditions for the hygiene requirements of the food industry. The machine sets the cyclone separation and collecting materials. In addition, the bag dust removal receipt is added to increase the material recovery rate. It can improve the economic efficiency of enterprises. The dryer can be customized according to user needs.