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In the crystal structure of the title salt, [Ag(NH3)2]4(C7H6O7S2)2·H2O, the four independent AgI complex cations all lie on special positions of m site symmetry, as do the two independent 2-hydroxy-5-methylbenzene-1,3-disulfonate anions. The AgI cations exist in an almost linear coordination geometry [N—Ag—N = 175.2 (2), 178.08 (16), 175.8 (2) and 178.20 (19)°]. The water molecule is disordered about a mirror plane. Two independent complex cations are linked by an Ag...Ag interaction of 3.3151 (1) Å, furnishing a linear [Ag(NH3)2]n polycationic chain running along b. The free complex cations, polycationic chain and 2-hydroxy-5-methylbenzene-1,3-disulfonate anions interact via N—H...O and O—H...O hydrogen bonds, forming a three-dimensional network.