BACKGROUND: Colorectal cancer (CRC) is a malignant tumor with the third highest incidence worldwide. The comprehensive economic evaluation of programmed cell death protein-1 inhibitors in China, however, has not yet been carried out. The aim of this study is to assess the cost-utility of pembrolizumab and nivolumab in the treatment of metastatic colorectal cancer (mCRC). MATERIALS AND METHODS: A Markov model microsimulation of efficacy and cost-utility analysis (CUA) was carried out, and efficacy and safety data were compared using network meta-analysis. Literature screening and data extraction were performed according to established criteria where the main outcome indicators, complete response (CR), partial response (PR), stable disease (SD), and progressive disease (PD) were compared between two treatments. The lifetime cost and outcomes of mCRC treatment were estimated, and quality-adjusted life years (-QALYs) and incremental cost-effectiveness ratio (ICER) were used to evaluate the economy of each program. RESULTS: A total of 442 studies were evaluated of which 15, with a total of 798 patients, were included in the analysis. Of these, 13 evaluated PD, and total patients for CR, PR, SD, and PD were 82, 283, 160, and 180 respectively. The corresponding heterogeneity values were (p = 0.13, heterogeneity index as percentage (I CONCLUSION: Both pembrolizumab and nivolumab showed beneficial effects in patients with mCRC. Nivolumab in combination with ipilimumab led to improved progression-free survival, but the values for ICER reached 8,918,075 ¥/QALYs. Treatment of non-resectable or metastatic microsatellite instability-high (MSI-H)/deficient mismatch repair (dMMR) advanced solid tumors CRC with pembrolizumab alone, in the Chinese population examined, was the most cost-effective, where the willingness-to-pay threshold was 242,928 ¥/QALY (100 ¥ = 13.75 USand 12.63 €).