Hot air circulating oven

The utility model relates to the technical field of drying equipment, in particular to a hot air circulation drying oven which comprises a shell, a drying frame and an air blower, an exhaust pipeline communicated with the outside is arranged at the top end of the shell, a first cavity, a second cavity and a third cavity are formed in the shell, and the drying frame is arranged in the center of the second cavity. A plurality of trays are further arranged on the drying frame, the air blower is arranged in the first cavity, and a heating plate is further arranged at the front end of the air blower. A to-be-dried object is placed on the tray, then the air blower transmits external air into the first cavity, the air is heated through the heating plate, and the heated air is uniformly transmitted into the second cavity through the two conveying pipelines; the two conveying pipelines can evenly convey the heated air to the multiple trays firstly, so that moisture of objects to be dried is evaporated into water vapor