The invention discloses a photoelectrochromic element and a manufacturing method thereof. The method comprises the following steps of: forming at least one thin-film solar battery on a transparent base material, wherein the thin-film solar battery at least comprises an anode, a photoelectric conversion layer and a cathode, and one part of the surface of the anode is exposed from the thin-film solar battery; subsequently, depositing an electrochromic thin film on at least one surface of the exposed surfaces of the cathode and the anode; and subsequently, forming an electrolyte layer on the surface of the thin-film solar battery to cover the electrochromic thin film. The anode and the cathode of the thin-film solar battery are also used as the anode and the cathode of the photoelectrochromic element.