The present invention relates to a water-soluble organic photocatalyst and a water decomposition hydrogen producing photocatalyst system using the same. More specifically, it forms a nanometer-sized structure on the aqueous solution, and comprises a water-soluble organic ionic conjugated compound containing at least one ionic functional group, wherein the organic ionic conjugated compound is a C3 symmetric molecular structure ( C3 symmetry) is represented by the following Chemical Structural Formula 1. [Chemical Structural Formula 1] In Chemical Formula 1, R 1 , R 2 and R 3 are electron withdrawing groups, and each independently a pyridinium group ( ), Phenylammonium group ( ) And benzenesulfonate groups ( ) Is at least one of N is an integer of 0 to 8, X is an electron donor group and is represented by any one of Chemical Formulas 2 to 4 below. [Chemical Structural Formula 2] [Chemical Structural Formula 3] [Chemical Structural Formula 4] In Chemical Formulas 2 to 4, A 1 , A 2 , A 3 , A 4 , A 5, and A 6 are each independently H or CN.
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