The invention discloses an artificial intelligence medical imaging system for auxiliary diagnosis of tumor malignant risk stratification, comprising: a data acquisition module, a data preprocessing module, a model establishment module, a model verification and optimization module, a hierarchical diagnosis module and a database platform. The auxiliary diagnosis system for tumor malignant risk stratification of the present invention is based on artificial intelligence technology, which can realize successive stratification of malignant risk of tumors, simulate clinical diagnosis ideas, and detect benign lesions and malignant tumors with high precision using artificial intelligence models The ability to automatically diagnose space-occupying lesions with clear imaging features can substantially assist clinical management decision-making of space-occupying lesions, improve the existing workflow of clinical diagnosis, increase physicians' confidence in diagnosis, reduce work pressure, and reduce the risk of low malignancy The anxiety of patients with lesions has greatly improved the diagnosis rate of benign lesions and malignant tumors, and it is expected to realize the implementation of artificial intelligence clinical auxiliary diagnosis.