The title compound, [Pt(NH3)4]Cl2·4NH3, was crystallized in liquid ammonia from the salt PtCl2. The platinum cation is coordinated by four ammonia mol-ecules, forming a square-planar complex. The chloride anions are surrounded by nine ammonia mol-ecules, either bound within the platinum complex or solvent mol-ecules. The solvent ammonia mol-ecules are packed in such a way that an extended network of N-H⋯N and N-H⋯Cl hydrogen bonds is formed. The structure is isotypic with [Pd(NH3)4]Cl2·4NH3 [Grassl & Korber (2014). Acta Cryst. E70, i32].