The machine is equipped with a preheating and recovery device, which can recover 70% of the heat generated during the drying and dehumidification process, truly achieving the effect of energy conservation and emission reduction; The control system adopts fully automatic intelligent control, 7-inch touch screen control, 10 level control of different time, temperature, humidity, mode and other functions, multi-functional operation, integrated design, easy installation, easy maintenance, and convenient disassembly and assembly. This machine can be used for food drying, agricultural product drying, etc.