The tunnel drying line is a tunnel type chain mesh belt through drying equipment that uses a special chain drive to transport workpieces. It is a novel continuous drying equipment with drying and other functions. The workpiece is manually placed on the transmission chain mesh belt, and the material is discharged after being dried in sequence. The mist inside the upper hood is extracted by the suction fan and discharged into the main exhaust duct. This machine has the advantages of full functionality, reasonable structure, convenient operation, and good drying effect, which is of great significance for mass drying, improving the labor environment, and improving quality. The body structure adopts a sealed type, with a beautiful appearance and convenient equipment disassembly and maintenance.