People have the absolute right to choose freely, which is an important viewpoint of existentialism. This view is derived from "existence precedes essence". Man's absolute freedom of choice does not necessarily lead to the proliferation of individualism, because existentialism emphasizes that man has absolute freedom and gives him the obligation to bear responsibility. Existentialism's view of free choice has important enlightenment significance to today's school moral education: establish a new view of freedom as the basis of school moral education; We should develop students' moral autonomy by letting them freely choose their values; School moral education should encourage students to freely choose moral values; Moral teaching should adopt as many methods as possible, so that students can freely draw moral conclusions.