Objective To search for, assess, and summarize the best evidence for antimicrobial allergy assessment in hospitalized patients, so as to provide an evidence-based basis for clinical nursing practice. Methods UpToDate, BMJ Best Practice, National Guideline Clearinghouse, Guidelines International Network, Yimaitong, JBI Evidence Synthesis, Cochrane Library, CINAHL, Embase, PubMed, Web of Science, China National Knowledge Infrastructure, Wanfang Data, CQVIP, SinoMed, and related association websites were searched by computer for literature about clinical decisions, guidelines, expert consensuses, evidence summaries, systematic reviews and meta-analyses related to antimicrobial allergy assessment in hospitalized patients. The search time limit was from the establishment of the databases to September 2024. Two researchers trained in evidence-based practice screened the literature and evaluated the quality independently. Finally, the evidence-based research group extracted and integrated the evidence after discussion. Results Totally 8 articles were involved, including 6 guidelines and 2 systematic reviews. Finally, 25 pieces of best evidence were obtained across 6 aspects, including the importance of antimicrobial allergy assessment, the subjects of allergy assessment, the personnel conducting allergy assessment, the content of allergy assessment, the recording of allergy history, and assessment tips. Conclusion When applying and transforming evidence, medical staff should fully consider the actual clinical situation and explore the evaluation scheme of antimicrobial allergy history of hospitalized patients with local characteristics, to improve the accuracy of evaluation of antimicrobial allergy history of hospitalized patients, so as to strengthen the safety management of drug use and improve the level of rational drug use.