PROBLEM TO BE SOLVED: To provide a communication system for agricultural work machines, which can be applied to agricultural work machines mounted on a tractor and has higher versatility of communication. A communication conversion device (12) wiredly connected to a display device (11) that can be arranged in a tractor (1), an actuator (23) installed in an agricultural work machine (2), and a communication conversion device (12) that controls the actuator (23) and is wire-connected to the communication conversion device (12) for communication. The communication conversion device 12 and the control part 21 are provided with a plurality of wirings in parallel, and the communication between the display device 11 and the communication conversion device 12 is the first. 1 is used, communication between the control unit 21 and the communication conversion device 12 uses the second communication system, and the communication conversion device 12 receives data from the display device 11 and transmits it to the control unit 21. When doing so, the first communication method is converted to the second communication method. [Selection diagram] Figure 1【課題】トラクタに装着する農作業機に適用できて通信の汎用性をより高くした農作業機用通信システムを提供することを目的とする。【解決手段】トラクタ１に配置可能な表示装置１１と有線接続される通信変換装置１２と、農作業機２に設置されるアクチュエータ２３と、アクチュエータ２３を制御し通信変換装置１２と有線接続されて通信が可能な制御部２１とを備え、通信変換装置１２と制御部２１の間の有線接続は、複数の配線が並列に設けられており、表示装置１１と通信変換装置１２の間の通信は第１の通信方式を使用し、制御部２１と通信変換装置１２の間の通信は第２の通信方式を使用し、通信変換装置１２は、表示装置１１からのデータを受信し制御部２１へ送信するときは、第１の通信方式から第２の通信方式へ変換する。【選択図】図１
