In the title compound, [K(2)PtCl(4)(C(12)H(24)O(6))(2)], the Pt(II) ion is located on an inversion centre and is coordinated by four Cl atoms, forming a square-planar geometry. The K(I) ion is coordinated by six O atoms of the crown ether and two bridging Cl atoms. The K(I) ion is displaced by 0.756 (2) Å from the mean plane of the six O atoms of the crown ether. The mol-ecules are connected by weak C-H⋯O hydrogen bonds, forming an infinite two-dimensional network parallel to the (10) plane. Intra- and inter-molecular C-H⋯Cl hydrogen bonds are also observed.