In the 21st century, due to the great breakthrough of computer performance, artificial intelligence ushered in rapid development. Artificial intelligence has been woven into every aspect of our lives, but it's only in the last decade that it has come to the fore in medicine. In the 21st century, due to the continuous development of medical technology and the generation of a large number of data, there are a lot of diagnostic errors, treatment errors, resource waste, low work efficiency, inequity and insufficient time between patients and clinicians in clinical work. This has led to a rapid increase in the need for AI in medicine. This paper reviews the development of artificial intelligence and its application in medical field in recent years.