The disclosure discloses a remote radio unit, which comprises: a common slot, an antenna and a plurality of function modules; wherein the common slot is connected with the antenna and comprises a plurality of slots, and each function module is inserted in a different slot of the common slot respectively. The disclosure can solve the problem that a remote radio unit is extended inconveniently while adding frequency bands and the whole remote radio unit will be greatly affected in most cases when a fault occurs in the module supporting one frequency band.