Building an agricultural informatization application system and carrying out diversified intelligent platform information construction under the background of big data caters to the basic comprehensive concept of "digital China" and "digital agriculture" development. The paper mainly interprets several technical analyses in the application system of agricultural big data informatization, and constructs a modern agricultural information management platform, hoping to help with the rapid development of agriculture in China in the future. Sort out the current situation of agricultural and rural informatization construction at home and abroad, point out the existing problems, and analyze the trend of agricultural and rural informatization construction under the background of big data, and propose suggestions for agricultural and rural informatization construction.