The invention belongs to a radio frequency transmission device and discloses a radio frequency communication circulator and an isolator. The radio frequency communication circulator comprises a casingand an electromagnetic limiting device arranged in the casing. The casing is provided with three connectors, and the signal one-way annular transmission among the connectors is restricted by the electromagnetic limiting device. The electromagnetic limiting device comprises a circuit board and a gyromagnetic body, the gyromagnetic body comprises a center conductor of a Y-shaped structure and ferrites arranged on two sides of the center conductor to sandwich the center conductor, and an additional magnetic field is arranged at the outer side of the ferrites such that the ferrites form magnets whose gyromagnetic characteristics to restrict an incoming microwave radio frequency signal from one-way annular transmission. Through optimizing an internal structure, the volume is reduced, and the degree of integration is raised.