The objective of this work is the synthesis and the characterization of new hybrid material, tin(II) oxalate, which has been prepared using hydrothermal method which is simple and very effective. Its crystal structure has been solved from single-crystal diffraction data. The symmetry is monoclinic, space group C2/c (No.15), cell dimensions a=10.3696(3) í…, b=5.5042(2) í…, c=8.2312(3) í…, β=125.092(2)° and Z=4. The characterization of new compound, tin(II) oxalate with  formula SnC₂O₄, by X-ray single crystal shows that this compound has a three dimensional structure constitute of tin polyhedrons SnO₆, with the lone pair of electrons presumably occupying one apex, linked together by oxalate groups. The resulting framework displays ellipsoidal holes parallel to c-axis.