Objective To investigate the level of and factors associated with attitudes toward adverse event reporting among emergency nurses. Methods A total of 165 nurses working in emergency department were selected from 3 first-rank tertiary hospitals in Shenyang in terms of their attitude to reporting of clinical adverse events. Results They scored 65.69±11.89 on reporting of adverse nursing events, with the highest score on dimension of reporting standard, followed by impact of reporting, purpose of reporting, and reporting environment. Age, length of service, working post, professional title, and education level were factors influencing emergency nurses′ reporting of adverse events (P<0.05, P<0.01). Conclusion Emergency nurses′ attitude to reporting of adverse nursing events was at a medium level and needed to be improved. Nursing managers should improve reporting standards, and strengthen education on nurses with shorter length of service, lower professional title and education level, thus to enhance nurses′ awareness of reporting and promote reporting rate.