There are many reasons for the transformation of Lu Xun's thought. During his study in Japan, he was exposed to western culture and ideas and was inspired and influenced. During the period of social change and turbulence in China, he deeply realized the social problems and human suffering, and began to think about the way out and redemption of mankind. Lu Xun's ideological transformation is a gradual process, which is gradually formed in the in-depth thinking and reflection on society and mankind. His ideological changes also reflected the changes and development of China's modern cultural thoughts, which had a far-reaching impact on the development of China's cultural thoughts.