Abstract:Lu Xun's humanistic belief mainly belongs to moral beliefs. These beliefs include two types, one is introverted humanitarian belief, its basic content is to emphasize self humanitarian accomplishment; one is the extroverted humanitarian belief, its basic content is to emphasize respecting people's various reasonable rights,objecting against all kinds of unreasonable rights and those having no positive significance to the development of society and human. No matter what kind of humanitarian belief Lu Xun believes in, because they can be verified by fact or theory logic, they all have knowledge, especially the attribute of theoretical knowledge. Not only that,Lu Xun's introverted and extroverted humanitarian belief also has the significance and value of enriching past humanitarian theory.