The utility model discloses a drying oven for drying the inner surface of a tire. The drying oven comprises an oven body which is of a cuboid structure. An oven door is arranged on one side face of the oven body, and an air pipe for utilizing heat in a recycling mode is arranged on the other side face of the oven body; an air inlet of the air pipe is fixedly connected with the top of the oven body, an air outlet of the air pipe is fixedly connected with the lower portion of the other side face of the oven body, and a circulation fan is arranged on the air pipe; a heating component is arranged at the air inlet of the air pipe, an inclined air guide pipe is arranged below the heating component, and the lower end of the inclined air guide pipe is connected with the upper end of an arc bent pipe; the arc bent pipe is inserted in an annular inner cavity of the tire to be dried, and hot air heated by the heating component is blown to the annular inner cavity of the tire to be dried along the lower end of the arc bent pipe. According to the drying oven, the hot air directly enters the annular inner cavity of the tire to be dried to be in full contact with the inner surface of the tire to be dried, circulation of the hot air in the oven body is quickened, heat energy is fully utilized, the drying effect is good, and efficiency is high.