The present invention relates to an automatic pile driver for a crop supporting rod, which comprises an impact driver, a pile driver body, a crank member, a hitting generating unit, and a hammer member. The impact driver includes a chargeable battery and a motor which is driven by power of the battery and generates rotating force. The pile driver body includes a combining body unit which is combined with the impact driver, and a vertical extending unit which is downwardly extended in the combining body unit and receives an end unit of a crop supporting rod inserted into a lower part thereof. The crank member is provided inside the combining body unit, is rotated by receiving the rotating force of the impact driver, and includes a combining pin eccentric from a rotating shaft. The hitting generating unit includes: a connecting rod one end unit of which is combined with the combining pin of the crank member to receive the rotating force； and a piston which is vertically reciprocated by being stored in the vertical extending unit in a state of being combined with the other end unit of the connecting rod, and has a hammer member inserting unit downwardly extended in a lower part thereof. The hammer member is provided in the vertical extending unit to be vertically reciprocated, has an upper part open to allow the hammer member inserting unit of the piston to be inserted, and is hit by the piston to deliver hitting force to the crop supporting rod. The present invention can easily install the crop supporting rod on the ground.COPYRIGHT KIPO 2019본 발명은 농작물 지주대 자동 항타기에 관한 것으로서, 충전 가능한 배터리와, 상기 배터리의 전력으로 구동되어 회전력을 생성하는 모터를 구비한 임팩트 드라이버 ； 상기 임팩트 드라이버에 결합되는 결합몸체부와, 상기 결합몸체부에서 하방으로 연장 형성되되 하부에 농작물 지주대의 단부를 삽입할 수 있는 수직 연장부를 포함하여 이루어지는 항타기 몸체 ； 상기 결합몸체부의 내부에 마련되어 상기 임팩트 드라이버의 회전력을 전달받아 회전되되, 회전축으로부터 편심된 결합핀을 구비한 크랭크부재 ； 일단부가 상기 크랭크부재의 결합핀에 결합되어 회전력을 전달받는 커넥팅로드와, 상기 커넥팅로드의 타단부에 결합된 상태로 상기 수직 연장부에 수용되어 상하 방향으로 왕복 운동하되 하부에 해머부재 삽입부가 하방으로 연장 형성되는 피스톤을 포함하여 이루어지는 타격발생부 ； 상기 수직 연장부에 상하
