TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Device: The solar photovoltaic electrochromic device further comprises the multiple output switch configurations connected with the film solar batteries and used for controlling the current output provided by the film solar batteries. The multiple film solar batteries are connected to the output switch configurations in parallel or in series. The multiple output switch configurations comprise the direct current/alternating current converting device used for converting the current provided by multiple film solar batteries into the commercial power. The multiple output switch configurations comprise direct current electric charge storage devices for storing the direct current provided by multiple film solar batteries. The multiple film solar batteries are arranged in matrix or in bar shape. The redox small organic molecular electrochromic material is selected from one or the combination of the cathode electrochromic material and the anode electrochromic material. The cathode electrochromic material comprises the methyl viologen, the ethyl viologen, phenyl viologen or propyl viologen. The anode electrochromic material comprises the dimethylphenazine or phenylenediamine. The solvent comprises the propylene carbonate, the ethylene carbonate, gamma -butyrolactone, acetonitrile, tetrahydrofuran or N-methyl-2-pyrrolidone. The component of the electrochromic solution comprises the alkali metal salt. The alkali metal salt comprises the lithium triflate, the lithium perchlorate or the tetra alkyl ammonium salt. The component of the electrochromic solution comprises the polyelectrolyte. The polyelectrolyte comprises the polyethylene oxide, the polypropylene oxide or the polymethylmetha acrylate. The redox electric potential of the electrochromic solution is less than 3 V. The semitransparent film solar battery base material comprises the film solar battery base material of the sheathing or the substrate structure. The multiple film solar batteries comprise the silicon film solar batteries, the copper indium (gallium) diselenide (CIGS) film solar batteries or the cadmium-tellurium film solar batteries. It further comprises multiple film transistors used for actively controlling the multiple film solar batteries.