In the title coordination polymer, [CdCl(2)(C(2)H(3)N(3)S)](n), the Cd(II) cation is coordinated by four Cl(-) anions and two N atoms from two trans 2-amino-1,3,4-thia-diazole (L) ligands in a distorted octa-hedral geometry. The L ligand and Cl(-) anions bridge adjacent Cd cations, forming a polymeric chain along the b axis; the separation between adjacent Cd cations is 3.619 (1) Å. In the crystal, the polymeric chains are inter-linking through N-H⋯Cl hydrogen bonds between the L ligands and Cl(-) anions.