The invention discloses a dual-mode digital radio remote unit (RRU), comprising a near-end machine and a far-end machine, wherein, DCS and WCDMA base station signals are respectively coupled to the near-end machine from a transceiver station of a base station by a coupler; digital processing is carried out on the signals by the system, and digitalized signals are transferred according to standardCPRI protocol; DCS and WCDMA base station signals are respectively transferred to the far-end machine of each coverage area; and the far-end machine regenerates and amplifies the signals to realize remote coverage for the DCS and WCDMA base station signals. The dual-mode digital radio remote unit of the invention has the advantages that digital transmission and regenerative amplification can be simultaneously carried out on signals of 2G-standard DCS and 3G-standard WCDMA, and meanwhile, the dual-mode digital radio remote unit has star, daisy chain and mixed type networking properties, has obvious superiority in solving large area and long distance signal coverage, has important significance on reducing construction cost of 3G network in primary stage of 3G network construction, and has vast prospect for future development.