The invention relates to the technical field of food safety monitoring, and particularly discloses a whole-process supervision method for public canteen food safety, which comprises the following steps: traceability supervision; Warehouse management; Video supervision; Carrying out safety supervision; Supervising a food making process; Disinfecting and supervising; Carrying out reserved sample supervision; Qualification management. Technologies such as Internet of Things, big data, cloud computing, video intelligent analysis and the like are fully utilized, food safety supervision is comprehensively improved, food safety management modernization is promoted, and standardized, refined, efficient, informationized and standardized supervision can be realized from operation processes such as food raw material purchase and acceptance inspection, processing and cooking, meal preparation, tableware cleaning and disinfection and sample reserving. According to the invention, a canteen food environment can be created for students; Governments and supervision departments are helped to effectively supervise schools and kindergartens; Food safety awareness of schools and kindergarten canteens is enhanced, a food safety management system is perfected, food safety responsibilities are put into practice, and food poisoning events are prevented and controlled.