Eight randomized controlled trials including 274 patients who underwent ACL reconstruction (ACLR) were included in this systematic review and meta-analysis comparing Low-Load Blood Flow Restriction (LL-BFRT) to conventional rehabilitation training within six weeks postoperatively. Pooled outcomes of interest included quadriceps muscle volume, knee joint function (Lysholm scores), balance function (Y-balance test), and reported complications. LL-BFRT significantly improved quadriceps muscle volume and Lysholm scores compared with conventional rehabilitation training. However, no significant improvements were observed in the three directions of the Y-balance test. No complications were reported in any included studies. These findings suggest that early LL-BFRT after ACLR effectively enhances quadriceps muscle recovery and knee function without increasing adverse effects.