In the traditional English learning mode of vocational college, teachers and students spend a lot of time on the basic knowledge of English. Due to the singularity of teaching methods and the lack of effective student self-learning platform, many students consider that English learning is boring and the actual learning effect is poor[1-2]. As an emerging edge discipline, artificial intelligence covers a series of topics such as image recognition, pattern recognition, robotics, natural language understanding and expert systems. The simulation and application of human language intelligence is an essential progress of artificial intelligence technology[3]. This paper will analyze the connotation of artificial intelligence technology and its principles of natural language understanding, and sort out the application advantages of artificial intelligence in education field. Finally, it puts forward practical measures of adopting artificial intelligence tools in input and output stages of English language learning[4-5].