The invention discloses a dendrobium officinale hot air circulation drying machine special for fish feed processing. The dendrobium officinale hot air circulation drying machine comprises a drying box, a first heater, a rotating motor and a second heater, wherein the first heater is mounted in the middle of the lower part of the drying box; a heat conducting layer is arranged at the bottom end in the drying box; the output end of the first heater is connected with the heat conducting layer; a rotating shaft is mounted at the bottom end in the drying box; a spiral blade is mounted on the outer side of the rotating shaft; a guide wheel is mounted at one end of the rotating shaft; and a rotating motor is mounted at the end, close to the guide wheel, of the side wall of the drying box. According to the dendrobium officinale hot air circulation drying machine, double heating systems are adopted, the first heater cooperates with the heat conducting layer to directly heat the interior of the drying box to evaporate moisture to dryness, and the first heater cooperates with the second heater to heat a third air guide pipe, so that air entering the drying box is hot, and dried moisture is prevented from condensing when encountering cold air.