The invention relates to an intelligent control method of visual monitoring and visual servo of tumor radiation therapy. The method comprises: (1) according to multi-mode medical images and multi-vision optical images collected by a radiation-oncology-plan-stage simulation and positioning medical imaging system, a radiation-oncology-positioning-stage treatment room internal optical imaging system, and a radiation-oncology-plan-execution-stage onboard medical imaging system and the like, intelligent analysis processing is carried out to monitor, identify and localize a tumor radiotherapy target and an organ at risk, radiotherapy beds with patients, radiotherapy equipment, and the auxiliary treatment staff and objects in a treatment room during the whole radiotherapy process; and (2), on the basis of optical images and/or medical images collected at different stages of the tumor radiotherapy process as well as the quality guaranteeing requirement of the clinical radiotherapy process, a multi-stage multi-vision servo intelligent control system (algorithm) is used for carrying out intelligent, automatic, high-precision, high-robust visual servo control on the radiotherapy beds, radiotherapy equipment, the onboard medical image system, and the optical imaging system in the treatment room during the tumor radiotherapy process.