Circulating hot air oven

The utility model discloses a circulating type hot air drying oven which comprises an oven body, and a drying bin is arranged at the top of the interior of the oven body. The plurality of placing racks are rotatably arranged in the drying bin; a placing plate and a movable groove are arranged in the placing frame, the movable groove is formed in the placing frame, the placing plate is arranged in the movable groove in a drawable mode, and a movable rod is arranged at one end of the placing plate; the heating bin is arranged at the bottom in the box body; the transmission mechanism is connected with the plurality of placing racks; and the driving mechanism is used for driving the transmission mechanism. The movable grooves are formed in the containing frames, the movable rods are arranged at one ends of the containing plates, the containing plates can be arranged in the containing frames in a drawable mode, the transmission structure is driven by the driving structure to rotate, the multiple containing frames