An　automatic　angular-spectrum　filtering　for　the　phase　reconstruction　of　dual-wavelength　digital　holograms　in　a　common-path　configuration　is　presented.　The　major　procedure　of　this　automatic　angular-spectrum　filtering　consists　of　excluding　the　zero-order　region　of　Fourier　spectrums　and　locating　the　center　of　order　+　1　region　of　the　angular　spectrums　for　two　individual　wavelengths.　The　phase　map　of　the　object　is　retrieved　with　the　automatic　angular　spectrum-filtering　algorithm　in　dual-wavelength　digital　holographic　system,　which　demonstrates　that　the　automatic　angular　spectrum-filtering　algorithm　is　feasible　and　effective.　It　provides　an　efficient　solution　for　angular-spectrum　filtering　in　real　time　dual　wavelength　digital　holographic　microscopy.