In the title compound, di-μ-cyanato-1:2κ2N:C;2:3κ2C:N-di­cyanato-2κ2C-bis­(1,4,7,10,13,16-hexa­oxa­cyclo­octa­deca­ne)-1κ6O;3κ6O-1,3-dipotassium(I)-2-platinum(II), [K2Pt(CN)4(C12H24O6)2] or [K(18-crown-6)]2·[Pt(CN)4], two trans-orientated cyano groups of the square-planar [Pt(CN)4]2− dianion (Pt site symmetry [\overline{1}]) bind to one potassium ion each, which are additionally coordinated by the six O atoms of 18-crown-6. No Pt⋯Pt inter­actions occur in the crystal, but very weak Pt⋯H contacts (2.79 Å) are observed.