The present invention provides a compound with benzyloxy aromatic ring structure represented by general formula (I), its stereoisomer, enantiomer or pharmaceutically acceptable salt thereof, its preparation method, and its pharmaceutical combination objects and their uses. The compound represented by the general formula (I) can be used to prepare small molecule inhibitors of PD1 / PD-L1 interaction, which can be used to prevent and / or treat diseases related to PD1 / PD-L1 interaction, especially cancer , such as, inter alia, non-small cell lung cancer, small cell lung cancer, melanoma, head and neck cancer, kidney cancer, bladder cancer, locally advanced or metastatic urothelial cancer, breast cancer, cervical cancer, metastatic Merkel cell carcinoma, prostate cancer Carcinoma, liver cancer, colon cancer, gastric cancer, multiple myeloma, mantle cell lymphoma, diffuse large B-cell lymphoma liver cancer, Hodgkin's lymphoma, chronic lymphocytic leukemia, squamous cell carcinoma and other cancers.