The utility model relates to an air inlet and moisture exhaust device of a test oven. The drying oven comprises an oven body, the rear side face of the oven body is sequentially provided with a moisture exhaust port and an air inlet from top to bottom, the drying oven further comprises a moisture treatment pipe and an air inlet cover, an input port of the moisture treatment pipe is communicated with the moisture exhaust port, and a first filtering assembly, a condensation assembly and a drying assembly are sequentially arranged between the input port and an output port of the moisture treatment pipe; the air inlet cover is fixed to the outer side of the air inlet, a first air inlet and a second air inlet are formed in the bottom and the rear portion of the air inlet cover respectively, andthe second air inlet is communicated with an output port of the moisture treatment pipe. The drying oven is simple and reasonable in structure, moisture exhausted by the drying oven is sequentially filtered, condensed, dried and re-filtered and finally flows back into the air inlet of the drying oven, gas recycling is achieved, and the moisture exhaust effect is good.