Legal analysis: No, it is illegal for in-service teachers to work part-time in off-campus education and training institutions. It not only violates the teacher's obligation stipulated in the Teachers Law, that is, to complete the education and teaching tasks; It also violates the provisions of the Labor Contract Law prohibiting the establishment of more than two kinds of labor relations at the same time.

Legal basis: Article 8 of the Teacher Law of People's Republic of China (PRC) shall fulfill the following obligations:

(1) Abide by the Constitution, laws and professional ethics, and be a model for others;

(two) to implement the national education policy, abide by the rules and regulations, implement the school's teaching plan, fulfill the teacher employment contract, and complete the education and teaching tasks;

(3) To educate students on the basic principles determined by the Constitution, patriotism and national unity, legal education, ideological and moral education, culture, science and technology education, and organize and lead students to carry out beneficial social activities;

(4) Caring for and caring for all students, respecting their personality and promoting their all-round development in morality, intelligence and physique;

(five) to stop acts harmful to students or other acts that infringe on the legitimate rights and interests of students, and to criticize and resist phenomena harmful to the healthy growth of students;

(6) Constantly improve ideological and political awareness and the level of education and teaching.