Objective To analyze the influencing factors of single-center day surgery patients who are discharged from the hospital on the same-day, in order to provide reference and basis for the clinical practice of follow-up day surgery. Methods The electronic medical records of patients who underwent day surgery in the Day Surgery Center of the First Affiliated Hospital of the Air Force Military Medical University between February and October 2021 were analyzed retrospectively. The patients were divided into the same-day discharge group and non-same-day discharge group. The baseline data and perioperative indicators of the patients were analyzed. Results A total of 857 patients were included, including 264 patients (30.81%) in the same-day discharge group and 593 patients (69.19%) in the non-same-day discharge group. Univariate analysis showed that there were significant differences between the two groups in gender, age, body mass index, whether the first one, disease classification, anesthesia method, and intraoperative blood loss (P<0.05). Logistic regression analysis showed that gender, whether the first one, disease classification, surgical grade, anesthesia method, and intraoperative blood loss were independent factors affecting the delayed discharge of patients undergoing daytime surgery (P<0.05). Conclusions There are many factors that affect day surgery patients’ discharge. It is suggested that more rigorously screen patients for day surgery, improve medical technology, strengthen out-of-hospital continued care, and optimize management procedures, so as to shorten the time of patients in hospital and provide more information for patients, and provide more efficient and convenient medical services for patients.