In China, agricultural production still mainly based on manpower, while agricultural labor population continuously declining, low agricultural resource efficiency, average agricultural resource shortage, low average age of new generation farmers and population aging in practical agricultural labor are the main troubles in developing agriculture. Research of intelligent devices and models to realize precise agriculture is a criticle approach to solve the problems and realize modernlization agriculture in China. IoT (Internet of things) in agriculture is an advanced technology aims at digging agricultural productivity potential, intelligentize agricultural equipment and realizing intelligent production, it includes agricultural information perception, agricultural information transmission and intelligent information processing technologies, IoT in agriculture focusing on applying in field planting, facility horticulture, livestock feeding, aquaculture and agricultural products logistics according to individual requirements. The progress of IoT in agriculture was concluded in last three years, which mainly focused on important breakthroughs of agricultural individual identification technologies, agricultural sensing theories and crafts, low-power wide-area network (LPWAN) technologies, agricultural big data technologies and artificial intelligent technologies. A framework of IoT in agriculture was proposed that agricultural operational control was based on agricultural operational models and self managed device network, according to the framework, the role of human was consumer of real-time data and valuable information, the labor output was based on IoT drived intelligent equipment. Furthermore, restriction factors were summarized by contrasting IoT applications in China and in advanced agricultural countries, the development strategy was raised for the development of IoT in Chinese agriculture, and finally the perspectives and main research issues of IoT were concluded in Chinese agriculture.