Preschool children’s English teaching is a method based on the common psychological characteristics of preschool children, which can promote preschool children’s English learning efficiently. In term of the characteristics of preschool children’s language learning, preschool age is critical period for preschool children to acquire languages. Only by seizing this period, could it get the best aim of English learning. This paper tries to reveal the relationship between preschool children’s psychology development and preschool children’s English teaching, put forward some suitable preschool children’s English teaching principles and methods through analyzing preschool children’s common characteristics of their psychology, including cognitive, language acquisition, memory and thinking. Only applying preschool children’s psychology in English teaching practices, could teachers protect preschool children’s psychology efficaciously and express the knowledge of English to preschool children.