The poly(N-isopropylacrylamide)/gelatin (PNIPAM/Gelatin) smart thermochromic hydrogels were prepared using N,N’-methylenebisacrylamide (MBAA) as the crosslinker, gelatin and NIPMA as matrix via the combination of photoinitiated polymerization and salting-out effect. The mechanical properties, conductivity, and thermochromic behavior of the PNIPAM/gelatin hydrogels were studied using scanning electron microscopy (SEM), tensile testing, electrochemical workstation, and UV-visible spectrophotometer. The results showed that as the content of NIPAM decreased, the mechanical properties of the hydrogels increased first and then decreased. As the temperature increased, the transparency of the hydrogels decreased due to the phase transition. When the temperature decreased, the transparency of the hydrogel was restored, indicating the potential applications of the hydrogel in the field of smart windows.