A simple and effective strategy was developed to immobilize ecofriendly dye inside a porous metal-organic framework (MOF) built from Eosin Y with [Cd-2(COO)(2)(mu(2)-H2O)] secondary building units for the first time. The MOF exhibited efficient photocatalytic activity for H-2 evolution under visible-light irradiation with a turnover number of 13920 and an initial turnover frequency of 7433 h(-1), which was approximately 31 times the photocatalytic efficiency of Eosin Y.