Objective: To understand the epidemiological characteristics of school foodborne disease outbreaks in Liaoning Province, and to provide scientific basis for effective prevention and control of school foodborne disease outbreaks in the future. Methods: An epidemiological study was conducted on the school foodborne disease outbreaks reported by the National Foodborne Disease Outbreak Surveillance System in Liaoning Province from 2011 to 2021. The influencing factors of school foodborne disease outbreaks were analyzed by binary Logistic regression. Results: From 2011 to 2021, a total of 29 school foodborne outbreaks were reported in Liaoning Province, with accumulative cases of 1 003, 218 hospitalized cases and no death cases. The number of outbreaks and cases were the highest in 2020(7 cases, 320).The incidence of the disease showed a bimodal distribution throughout the year, with the peak in March and December, and the number of outbreaks in schools in March was the largest(8 cases,27.59%). Primary and secondary schools reported the largest number of incidents, cases and hospitalizations(12 cases, 555, 97). The mean interval of outbreak reporting was longest in junior college (32.01 h), while the mean duration of outbreak was longest in university ( 52.33 h ). Most of cases (536,53.44%) had vomiting symptoms. Staphylococcus aureus toxin, Bacillus cereus toxin and Norovirus caused more incidents(3 cases for each one). In addition to the unknown causes, improper processing and cross contamination were the main causes(6 cases for each one). Headache index was positively correlated with outbreak size in schools ( OR = 9.78). Clinical symptoms fever and exposure duration event indexes were positively correlated with the reporting time interval of school outbreak events ( OR =7.08, 22.40)( P <0.05). Conclusion It is necessary to strengthen the management and supervision of school catering institutions in winter and spring, optimize the reporting process, and effectively reduce the scale of outbreaks of foodborne diseases in schools.