The utility model belongs to non-woven machinery field, and particularly relates to a hot air penetrating-type drying oven. The drying oven comprises an oven casing, a main fan, an electric heater, amain air sending and blowing channel, a main air suction channel and a transmission curtain, wherein the main fan, the electric heater and the main air sending and blowing channel are arranged above the oven casing; the main air suction channel is arranged under the oven casing; the transmission curtain is positioned between the main air sending and blowing channel and the main air suction channel; a precooling device is arranged under the output end of the transmission curtain, and comprises a casing with an air gap formed at the upper end; and at least one suction fan is mounted on the outerside of the casing of the precooling device. The utility model can overcome the fiber web floating and cooling defects existing in the prior art.