According to the nature of preschool education, the functions of preschool education can be divided into expected functions and practical functions. The so-called expectation function refers to the ideal function of preschool education, that is, it can generate positive energy for individuals or society. The low crime rate shows that preschool education has given people a good direction and established correct values, world outlook and outlook on life, so the low crime rate reflects the expected function of preschool education. Actual function refers to the function or value that preschool education actually brings to individuals or society, that is, what practical benefits preschool education brings to the subject.