A high-efficiency integrated circulator/isolator includes a hollow base having an opening formed in the top, a coupler, a first resistor, and an SMP signal connector, wherein three notches are formed in the peripheral wall of the base, support bases are respectively arranged at the bottoms of the notches, and a laminated assembly is arranged in the base and includes a central conductor; and the coupler, first resistor, and SMP signal connector are respectively arranged on the support bases, the coupler has an output terminal electrically connected to an input terminal of the central conductor as well as a coupling terminal electrically connected to an external monitoring system, and the central conductor has an output terminal electrically connected to an input terminal of the SMP connector as well as an isolation terminal electrically connected to the first resistor. The circulator/isolator is integrated to a greater degree and is smaller in size.