The alpha- decay half-lives of the superheavy nuclei are systematically studied using different versions of proximity potential and a exact method to calculate Coulomb potential between spherical and deformed nuclei in the framework of the double folding model. To reproduce the alpha-decay half-life, the experimental alpha-decay energy and Wentzel-Kramers-Brillouin approximation have been used. It is found that the computed values by the Ngo 80 are in good compromise with the experimental half-lives in comparison with other versions. Also, by using this version and within QWS4 for determination alpha-decay energies for superheavy elements, we had predicted the alpha-decay half-lives for superheavy nuclei which have not been reported yet. The long half-lives with magnitude about 100 seconds are predicted for the superheavy nuclei which are not in stability islands which indicating remarkable stability in comparison with their neighbors. These results are also in good agreement with the predictions of other semi-empirical formulas.
