The utility model relates to a heating and humidity-reducing air-drying shelter with a built-in heat source, which belongs to the field of the crop drying facility. The heating and humidity-reducing air-drying shelter with the built-in heat source comprises an air-drying shelter, an underground stove and a ground chimney, wherein the underground stove comprises a combustion stove and a radiating chamber, the radiating chamber is connected with the periphery of the combustion stove in a surrounding way along the outer wall of the combustion stove, the top end of the combustion stove is provided with a flue gas outlet to be communicated with the chimney of the air-drying shelter, a valve plate is arranged in the chimney, fuel burns to produce heat in the underground stove, and combustion heat can heat the peripheral radiating chamber through the wall of the stove and can be transmitted through radiation of the radiating chamber so as to raise the temperature in the air-drying shelter, thereby promoting water evaporation in the air-drying shelter. The exhaust air rate of the chimney can be controlled through adjusting the valve plate in the chimney so as to control the combustion rate in the combustion stove, thereby realizing the purpose of appropriately adjusting the heating and humidity-reducing speed, shortening the crop drying cycle, and improving the quality of dried products. In addition, the utility model has the advantages of low construction and use cost and easy operation, and is suitable for drying of white burleys, raisins, dates, persimmons and other agricultural products.