Objective To explore the effectiveness and safeness of endoscopic posterior lumbar interbody fusion (Endo⁃PLIF) via large channel for the treatment of patients with lumbar spondylolisthesis in degree Ⅰ-Ⅱ. Methods The surgical data of 46 patients with lumbar spondylolisthesis undergoing Endo⁃PLIF via large channel were retrospectively analyzed. The operation duration, intraoperative bleeding volume, postoperative length of hospital stay, duration of antibiotic use, the occurrence status of operative⁃associated complications were recorded. The pre⁃ and postoperative Visual Analogue Scale (VAS) score, Oswestry disability index (ODI), and lumbar intervertebral space height and lumbar lordosis angle of operative segments were compared. Results All 46 patients successfully completed the operation. Patients were followed up for 12.0 to 19.0 (14.2±3.2) months. The operation duration of patients was 231.72 (170.50, 290.00) minutes, intraoperative bleeding volume was 80.00 (50.00, 100.00) mL, postoperative length of hospital stay was 3.00 to 11.00 (5.26±2.16) days, and duration of antibiotic use was 1.00 to 7.00 (2.98±1.42) days. One week and 1 year after operation, the VAS scores and ODI for low back and lower limbs were decreased as compared with before operation. One week and 1 year after operation, lumbar intervertebral space height was increased as compared with before operation; furthermore, lumbar lordosis angle of operative segments was enlarged as compared with before operation one year after operation (P<0.05). No intraoperative or postoperative blood transfusion, infection, fusion failure, dural tear and other complications occurred in all patients. One patient had unilateral internal fixation loosening after operation, and 1 patient was found to have inadequate drainage after operation, and the symptoms were significantly relieved after symptomatic treatment. Conclusion The clinical efficacy of Endo⁃PLIF via large channel for the treatment of patients with lumbar spondylolisthesis in degree Ⅰ-Ⅱ is satisfactory, with the advantages of less trauma and fast recovery, etc.