A method of manufacturing a thermochromic window, with which the thermochromic window can have increased visible light transmittance while maintaining the thermochromic characteristics thereof. The method includes the steps of forming a first transparent conductive film on a substrate, forming a pre-thermochromic thin film on the first transparent conductive film, and heat-treating a multilayer structure that includes the substrate, the first transparent conductive film and the pre-thermochromic thin film, thereby reforming the pre-thermochromic thin film into a thermochromic thin film.