The invention belongs to the technical field of medical early warning, and discloses an early warning system and method for cerebral apoplexy. The early warning system for cerebral apoplexy comprisesan image collection module, a physiological index collection module, a main control module, an image processing module, a risk evaluation module, a warning module, a data storage module and a displaymodule. According to the system and method, through the image processing module, automatic identification and segmentation of a cerebral ischemia zone in a super-acute stage can be achieved, and the segmentation precision of the ischemia zone is improved; data preprocessing, feature selection and feature optimization are conducted through the risk evaluation module, and obtained data features aremore effective; an XGBoost method is adopted for automatically generating the risk probability that a target group of people suffer from cerebral apoplexy, community health screening can be more efficiently and conveniently conducted, and a doctor can be helped to more simply and quickly evaluate the risk that the target group of people suffer from cerebral apoplexy; health screening can be strongly pushed, so that potential users with cerebral apoplexy are more quickly found, and earlier warning is given, so that earlier and more effective treatment is conducted.