Objective An incident of foodborne diseases was investigated and analyzed to provide reference for the prevention of such incidents.Methods Suspicious food， pathogenic factors and pollution sources were found through on-site epidemiological investigation， food hygiene investigation and laboratory testing.Results A total of 198 cases were searched， and the incidence rate was 50.13% （198/395）. The main symptoms were diarrhea （90.40%）， fever （87.88%） and abdominal pain （66.16%）， the average incubation period was 13.8 h （4-47 h）. Salmonella enteritidis was detected in 57 cases， 3 foods， 2 raw materials and 1 object surface. Pulsed field gel electrophoresis molecular traceability analysis was carried out on 3 foods， 2 food raw materials， 1 object surface and 11 randomly selected case samples. The result showed that the similarity of DNA fingerprints of the above samples was 100%.Conclusion The incident was a foodborne disease caused by eating hot dog salad bread contaminated by Salmonella. It is suggested that the food regulatory authorities should strengthen the supervision of food production enterprises and the training of food safety related knowledge for food practitioners to avoid similar incidents.