"Postmodernism", which was born in the secular context of the West, has the following characteristics: it emphasizes relativism and pluralism and rejects any belief in certainty and absolute value; He has been in conflict with essentialism, he considers human identity as a social construct; The emphasis of values on the formative realities and the necessary effects of actions on human destiny does not reflect. In terms of educational goals, he insists on institutionalizing pluralism, strengthening the spirit of self-management in students, and in terms of educational principles, he insists on avoiding dogmatism, fighting systematism, and emphasizing individual freedoms. In the educational methods, they emphasize inclusive discourse, serious attention to marginalized people and negation of role models. This idea, despite having a series of strengths, such as fighting against "globalization", fighting against "scientism" and emphasizing on "dynamism", is one of the points He also suffers from a lot of weakness. The most important of them is intellectual discontinuity and obvious contradiction in thought, ignoring certain facts and knowledge, as well as fixed and innate values. In this research, the descriptive method has been used to analyze the opportunities and threats of postmodernism in terms of ethics and moral values. The findings show that the postmodernists' view of cultural and social developments, despite its strengths and anti-imperialist aspect, also suffers from many weaknesses. Its most important weaknesses are the lack of solid and defensible intellectual foundations, the conflict with the emergent realities, certain knowledges and eternal values, which has caused the rupture of postmodernist ideas and being caught in the trap of contradictions and even obvious contradictions. By adopting a purely negative approach, they only criticize and destroy, but do not provide alternative solutions and theories. As by emphasizing the differences and sub-cultures, they neglect the cultural and moral commonalities of nations and schools. This movement or school of thought has ultimately led to moral and educational anarchism, and the result of following it will be the astonishment and confusion of the learners and the sinking of the society into the swamp of corruption and destruction.