AbstractA series of novel polymers, glycidyl 4‐functionalized 1,2,3‐triazole polymers (functionalized GTP) were synthesized by click functionalization of glycidyl azide polymer (GAP). Quantitative functionalization of the glycidyl polymer side groups was achieved due to the high reactivity of the azide–alkyne Huisgen cycloaddition under mild conditions. The polymers were characterized by 1H NMR, 13C NMR, IR, GPC, DLS, DSC, and TGA. We confirmed that the solubility, glass transition temperature, and decomposition temperature were controllable by changing the functional group attached at 4‐position of 1,2,3‐triazole group. Functionalized GTP expands not only the application field of GAP toward non‐explosive materials, but also the variety of poly(ethylene glycol) derivatives with different side groups.