Tetra digital cluster fiber-optic straight-set station is mainly composed of a master unit, multiple remote units and network management systems. The master unit is located on the side of the base station and is connected to the base station via an RF interface. It converts the radio frequency signal received from the base station into the optical signal, which is transmitted by optical fiber to the remote unit, and at the same time converts the optical signal transmitted from the remote unit to the radio frequency signal to the base station. The remote unit is set in each signal coverage place, it near the end of the downstream signal transmitted by the photoelectric conversion after the amplification, through the leakage cable or antenna to complete the extended coverage of the digital cluster signal. At the same time, the leak cable or antenna received upstream signal for low noise amplification, and then through the electro-optical conversion through the same fiber to the near-end machine. Both the near-end machine and the remote machine have the monitoring function, and can be managed uniformly through the network management center.