Hot air tunnel circulation fruit and vegetable drying machine and method

The invention discloses a hot air tunnel circulation fruit and vegetable drying machine and method. The drying machine comprises a frame, a workbench, a conveying system, a moisture discharging port, air blowing units, a motor, a circulating air duct, an air equalizer and an air volume adjusting system, wherein the conveying system is horizontally movably connected to an upper-middle part of an inner cavity of the frame and the workbench, the air blowing units are evenly distributed on a surface of a lower end of the conveying system at equal intervals, the circulating air duct is transversely and fixedly connected to the frame and the lowermost position of the inner cavity of the workbench, and the air volume adjusting system is movably connected to a lower-middle position of the inner cavity of the frame and the workbench. During hot air tunnel drying operation for fruits and vegetables, the drying machine can perform a certain humidity sensing operation on the fruits and vegetables that are about to leave