In this study, the equivalent film theory is used to develop a polarization- and phase-modulated mirror with target wavelengths of 780, 810, and 850 nm and an incidence angle of 45°. Apart from achieving polarization and phase modulation, the obtained mirror can ensure the high reflectivity of the thin films. A metallic material (Ag) and two dielectric thin film materials (such as Ta₂O₅ and SiO₂) are selected as the film materials to obtain high reflectance over a wide waveband. The mirror film system is fabricated on an optical glass substrate (JGS-1) using the electron beam evaporation, thermal evaporation, and quartz crystal oscillation monitoring technologies. The measured spectra of the mirror film system denote that the average reflectance is greater than 95% in the wavelength range of 500--1600 nm and the extinction ratios at the target wavelengths exceed 3000∶1, 5000∶1, and 7000∶1. Thus, the proposed mirror satisfies the reliability requirement associated with space-to-ground quantum communication.