The invention discloses a recombined photo synthetic protein molecule with a wide absorption spectrum and a construction method of the recombined photosynthetic protein molecule. Recombined chlorophyll binding protein, phycobiliprotein fusion protein and chlorophyll a are bound to form the recombined photo synthetic protein molecule. Firstly, by means of molecular biology and gene engineering, incombination with a phycobiliprotein chromophore in-vivo combined catalysis technology, a chlorophyll binding protein and full-chromophore phycobiliprotein fused molecule is constructed, heterogeneousexpression is performed in an escherichia coli engineering strain BL21, then chlorophyll a and the chlorophyll binding protein and full-chromophore phycobiliprotein fused molecule are subjected to in-vitro recombination, and finally a photosensitizer containing LHC II and the wide phycobiliprotein absorption spectrum is obtained. The mature method is provided for large-scale preparation of the recombined phycobiliprotein and LHC II chromoprotein molecule, and a new conception is provided for exploration of application of biology-base dye-sensitized solar cells and enlarging of the range of thedye sensitizer absorption spectrum.