Agricultural machinery intelligence technology is a significant driving force for development of modern agriculture．With rapid development of information technology, intelligent agricultural machinery integrates advanced technologies such as internet of things, big data, and artificial intelligence to achieve automation, precision, and intelligence in agricultural operations, which has significantly improved agricultural production efficiency, reduced resource consumption, and enhanced labor environment of farmers．Key technologies including intelligent perception, navigation and positioning, control, data processing and analysis, decision support, communication, and energy were analyzed in detail, and extensive application of intelligence technologies in agriculture was demonstrated through practical application cases in domestic and foreign countries．Despite remarkable achievements in field of intelligence agricultural machinery in China, issues such as technological stability, economic cost, shortage of composite talents, farmers' acceptance, and education training still limit its further promotion．