Objective: Despite intensive insulin treatment in patients with type 1 diabetes (T1D), many of them do not reach the glycemic target goal. We performed a network meta-analysis to evaluate the efficacy and safety of additional therapy to insulin in patients with T1D. Methods: We searched CENTRAL, MEDLINE, EMBASE, and Science Citation Index Expanded from January 1970 until September 2019 to identify randomized controlled trials (RCTs) in T1D patients treated with insulin and metformin, sodium-glucose cotransporter (SGLT) inhibitors or glucagon-like peptide-1 receptor agonists (GLP-1 RAs). We performed direct and indirect network meta-analysis using Bayesian models and generated rankings of the different hypoglycemia agents by generating mixed treatment comparison. Results: With 23 RCTs (n = 5,151), we performed the network meta-analysis using eight groups; 1) insulin alone, 2) insulin and metformin, 3) insulin and canagliflozin, 4) insulin and dapagliflozin, 5) insulin and empagliflozin, 6) insulin and sotagliflozin, 7) insulin and liraglutide, and 8) insulin and exenatide. Compared with insulin alone, HbA1c was significantly lower in the group treated with insulin and sotagliflozin (mean difference: -0.43%; 95% credible intervals: -0.62 to -0.23). Total daily insulin dose was significantly lower in the insulin and sotagliflozin group by 6.3 U/day than in insulin alone group. Compared with insulin alone, body weight was significantly decreased in the group treated with canagliflozin by 4.5kg, sotagliflozin by 2.8kg, and exenatide by 5.1 kg, respectively. Severe hypoglycemic episodes did not differ between the groups. Conclusions: In patients with T1D, sotagliflozin add-on to insulin decreased HbA1c levels, daily insulin dose, and body weight without hypoglycemia compared to insulin monotherapy. Combined treatment of canagliflozin or exenatide with insulin was effective in weight loss compared with insulin alone in these patients.