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The asymmetric unit of the title compound, {[MgNa2(C10H4O8)2(H2O)8]·2H2O}n, contains one octahedrally coordinated MgII atom (site symmetry 2/m), one octahedrally coordinated NaI atom (site symmetry 2) and one half of the dihydrogen benzene-1,2,4,5-tetracarboxylate (btec) ligand, the second half of the ligand being generated by a twofold rotation axis. The basic framework of the title compound features infinite (–Na–Na–Mg–)n chains along [10-1] with the metal cations bridged by the coordinating water molecules. The chains are isolated from each other by μ4-bridging btec ligands, which form intermolecular O—H...O hydrogen bonds to uncoordinated water molecules and the coordinated water molecules of a neighbouring chain. In each btec ligand, there are also intramolecular O—H...O hydrogen bonds.