The present invention provides a connection device of a farming machine, which safely and firmly connects a tractor with a working machine, transfers power from the tractor to the working machine, has a large-rotational angle thereof to allow easy entry into a cultivating area from a road, and also allows work to be performed up to a corner part of a field (cultivated land). The connection device of a farming machine comprises: a front body having an input yoke installed thereon and having an input shaft installed by passing therethrough； and a joint part formed in such a manner that upper and lower center parts of a rear body, which has an output shaft having an output yoke installed thereon is installed and passes therethrough, are installed to be rotated about a central pin, wherein the input yoke, the output yoke and a connection yoke are connected by means of a ″+″-shape bearing. A length of the connection yoke shaft coupled to the connection yoke on the ″+″- shape bearing is longer than each length of an input yoke coupling shaft and an output yoke coupling shaft, which are coupled to the input yoke and the output yoke, respectively. The outer diameter of each front end of the input yoke and output yoke is formed to be smaller than the inner diameter of an entrance of the connection yoke such that a part of each front end of the input yoke and output yoke is easily rotated without friction in a state of being received into the inner entrance of the connection yoke when the input yoke and output yoke are rotated, and a rotational angle is largely formed.본 발명은 트랙터와 작업기를 안전하고 견고하게 연결함과 동시에 트랙터의 동력을 작업기로 안전하게 전달하고, 또 연결장치의 회전각을 크게 하여 크게 하여 도로에서 경작지로의 진출입을 용이하게 함은 물론, 논이나 밭(경작지)의 코너부분 깊숙이까지 작업할 수 있도록 한 것으로, 그 구성은, 입력요크가 설치된 입력 축이 관통 설치되는 전방몸체와, 출력요크가 설치된 출력 축이 관통 설치되는 후방몸체의 상·하부 중앙부를 중심 핀을 매개로 회전되게 설치하여 된 관절부와, "+"자형 베어링을 매개로 상기 각 입력 및 출력요크와 연결요크를 연결 설치하여 된 농기계 작업기의 연결장치에 있어서, 상기 "+" 자형 베어링에서 연결요크와 체결되는 연결요크체결 축의 길이는 상기 각 입력 및 출력요크와 체결되는 입력 및 출력요크체결 축의 길이보다 길게 형성되고
