Objective To investigate the effect of complete bladder neck preservation（including the internal sphincter and the proximal urethra） on urinary control after robot-assisted laparoscopic radical prostatectomy（RARP）. Methods A total of 175 patients with prostate cancer who underwent RARP in The First Affiliated Hospital of Chongqing Medical University from October 2022 to August 2023 were enrolled，and according to whether the bladder neck was preserved during surgery，they were divided into experimental group（91 patients with bladder neck preservation） and control group（84 patients without bladder neck preservation）. The two groups were compared in terms of the general clinical indices including age，initial total prostate-specific antigen（TPSA） value，time of operation，intraoperative blood loss，drainage tube removal time，length of hospital stay，postoperative complications，and positive rate of resection margin，as well as urinary control rate and tumor recurrence rate at 1 day，1 month，3 months，and 6 months after urinary catheter removal，and a statistical analysis was performed. Results There was no significant difference in general clinical indices between the two groups（P>0.05）. There was a significant difference in urinary control rate at 1 day，1 month，and 3 months after urinary catheter removal between the two groups（P<0.05），while there was no significant difference in urinary control rate at 6 months（P>0.05）； no tumor recurrence was observed in either group within 6 months. Conclusion There are no significant differences in the positive rate of resection margin and tumor recurrence rate for the modified technique of complete bladder neck preservation，which can accelerate the early recovery of urinary incontinence and improve quality of life，and therefore，it holds promise for clinical application.