The invention discloses a quadruple frequency-based scheme for realizing a base station passive full duplex millimeter wave RoF link, which is mainly used for remote transmission of a wireless signal between a base station and a central station in a Gb/s broadband millimeter wave communication system. The scheme is as shown in an attached drawing. A local oscillator with a frequency of fD/4 drives a lithium niobate Mach-Zehnder modulator to produce a light carrier with a frequency interval of fD/2 and two second-order sidebands. One sideband is separated by an FBG to realize single wave carrier modulation of a downlink data signal. The light carrier is transmitted to the base station through an optical fiber, and the light carrier and a double-frequency light millimeter wave signal with afrequency of fD are separated by the Mach-Zehnder modulator with a delay time difference of 1/fD. The former is reserved as an uplink light source, and the latter produces a millimeter wave signal with the frequency of fD through photoelectric conversion, and the signal is transmitted to a user through an antenna. The uplink millimeter wave signal is processed by envelope detection to acquire a baseband signal, loaded onto a reserved light wave by a low-speed optical modulator and sent back to the central station by the optical fiber. The scheme has a plurality of advantages, so that the scheme has good application prospect.