Teacher ethics is an ethical category that is closely related to the changes in education triggered by technological development. The widespread use of artificial intelligence in education has brought new impetus and challenges to the development of teacher ethics. The development trend of teachers’ professional ethics includes: the moral obligation of teachers that emphasizes “educating people” as the core, the conscience of teachers that emphasizes the multiple meanings of “knowledge, emotion and will”, the realization of educational justice by the integration of “instrumental rationality” and “value rationality”. Therefore, to improve teachers’ level of professional ethics, it is necessary to find practical and efficient ways that are in line with the development trend of the times. By fostering developmental teachers, protecting and respecting students, and shaping a good image of teachers, teachers can better follow important aspects of professional ethics in the age of artificial intelligence: love and dedication, maintaining good teacher-student relationships, and being a role model.