Illegal. It is illegal for a school not to let students transfer. You can report this behavior directly to the local education department. If the school does not agree to transfer students or seal up their enrollment, it is illegal. You can report it to the local authorities. If the school violates the regulations, the competent department shall order it to make corrections; If the circumstances are serious, the principal and relevant personnel shall be investigated for responsibility according to law.

Legal objectivity:

"Measures for the Administration of Student Status of Primary and Secondary School Students" Article 27 If a school violates the provisions of these measures, it shall be ordered by the competent department to make corrections under any of the following circumstances; If the circumstances are serious, the principal and relevant personnel shall be investigated for responsibility according to law: 1. Failing to establish a student status file for the admitted students; Two, the establishment of student status or the establishment of student status files with false information; 3. Failing to incorporate the change information of student status into the student status file in time; Four, do not promptly report the situation of students dropping out of compulsory education; Five, the receiving students do not handle the transfer formalities for them; Six, not in accordance with the provisions of the transfer of student status files for students; Seven, leakage or illegal use of student information; Eight, other acts in violation of the provisions of these measures.