The present invention relates to an apparatus that injects air directly into soil so that a crop yield can be increased and harvest quality can be improved based on aerobic microbe breeding in the soil for cultivation. An agricultural air supply apparatus according to the present invention includes: a compressor generating compressed air； an air tank provided with a pressure gauge and a safety valve for overpressure prevention and storing the high-pressure compressed air under a set pressure condition； a decompression valve reducing the pressure of the air discharged from the air tank； a sprayer spraying water in the form of fine particles so that vapor is included in the supplied air； a distributor uniformly distributing the decompressed compressed air into a plurality of flow paths and opening and closing the flow paths performed by a control valve； an air supply pipe buried in the soil where a crop to be cultivated is planted and having a perforated portion for supply of the air passing through the distributor； and a control unit connected to the compressor, the pressure gauge of the tank, and the control valve of the distributor and controlling the supply of the compressed air. When the agricultural air supply apparatus is used, breeding and activities of aerobic microbes can be enhanced based on continuous air supply at a constant pressure, and thus the crop quality can be improved, blight resistance can be enhanced, and the yield can be increased. In addition, the underground conduit for air supply facilitates drainage in a rainy season, and thus flooding can be prevented and excess moisture injury can be minimized.본 발명은 재배지 토양에 호기성 미생물을 번식시켜 농작물의 수확량을 높이고 수확물의 품질을 높일 수 있도록 하기 위해 토양 속에 직접 공기를 주입하는 장치를 제공코자 하는 것이다.즉, 본 발명은 농사용 공기공급장치를 구성하되, 압축공기를 생성하는 컴프레서；와 압력계 및 과압방지를 위한 안전밸브가 설치되며 설정된 압력조건으로 고압의 압축공기를 저장하는 에어탱크；와 에어탱크로부터 배출되는 공기압을 감압시키는 감압밸브；와 공급하는 공기에 수증기를 내포시키기 위해 물을 미립자형태로 분무시키는 스프레이기；와 감압된 압축공기를 복수개의 유로로 균등하게 배분시키며 제어밸브에 의해 유로의 개폐가 이루어지는 배분기；와 재배할 작물이
