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First principles density functional theory calculations were performed to investigate the interaction of hydrogen molecule on Ni-decorated silicene. Ni was found to be stable on the hollow site of silicene as an isolated decoration. The decoration did not change the electronic property of the material. The H-H bond length has increased during its adsorption on Ni-decorated silicene. The H-2 was sufficiently bonded to the material with adsorption energy of 0.4393 eV. Both the bond length elongation and the sufficient bond energy indicate that the phenomenon is of a Kubas interaction. Furthermore, the charge analysis shows that H-2 was an electron donor for the interaction which is another property of a Kubas interaction. For H-2 storage application, the initial hydrogen adsorption energy was enough and within the optimal adsorption energy range.