This paper firstly researches the path to enhance the effectiveness of class teacher’s collaborative parenting in private colleges and universities, mainly studies the two collaborative parenting modes of “Counselor + Freshman Class Teacher” and “Class Teacher + Academic Mentor” and summarizes the roles and main links in the two modes. The two modes’ roles and subject connections are summarized. On the basis of the second decision tree, the C4.5 algorithm is used to calculate the sample data set and then get the results of student characteristic information gain, and then the decision tree is generated according to the results of student characteristic information gain, disaggregated attributes and split points. Then, the student characteristic information gain is used as the selection measure of attributes, and then the decision tree-based classroom teacher teaching and educating model is constructed, and the effectiveness of classroom teacher education in private colleges and universities is statistically analyzed. The results show that there are significant differences in the dimensions of caring for students [F(2, 86)=5.58, P=0.005] and instructing students’ ability [F(2, 86)=3.42, P=0.038] among classroom teachers of different classroom teacher’s tenure in private colleges and universities, and there are no significant differences in the other dimensions of educating people’s ability. This research knot promotes the improvement of classroom teachers’ parenting ability in private colleges and universities, which is important for the improvement of students’ learning ability.