Abstract: In order to meet the demand of quality control for farming mechanical subsoiling，a ploughing depth online detection system for hanging subsoiler was designed，and a remote monitoring platform for agricultural machinery working was established，based on Beidou satellite position technology，communication technology and Internet of Things technology.Field trial results indicated that the system was stable and reliable，and could adapt to working environment of deep loose operation，it could obtain real-time information of deep loose operation and statistics of working area in real time.The depth measurement error was within ±1 cm，and the accuracy of working area was higher than 99%，which could meet actual needs of remote monitoring and management of deep loose operation.