The invention relates to the field of biological medicines, and particularly provides a drug combination composition for treating tumor diseases, which comprises an anti-PD-1 monoclonal antibody taking PD-1 as a target spot and an anti-EGFR monoclonal antibody taking EGFR as a target spot. According to the invention, the anti-PD-1 monoclonal antibody and the anti-EGFR monoclonal antibody are combined for use, so that the medication safety is higher, the treatment response duration is effectively prolonged, the progression-free lifetime and the total lifetime of cancer patients are prolonged, the health condition and the life quality of the patients are improved, and the clinical application prospect is wide. The combined medicine composition can be used for treating non-small cell lung cancer, metastatic non-small cell lung cancer, glioma, colorectal cancer, liver cancer, hepatocellular carcinoma, metastatic hepatocellular carcinoma, HER2 negative metastatic breast cancer, metastatic gastric adenocarcinoma, metastatic colorectal cancer, metastatic melanoma, metastatic renal cell carcinoma and advanced esophageal squamous carcinoma. Advanced squamous non-small cell lung cancer or advanced head and neck squamous cell cancer.