The invention discloses a radio-frequency isolator with a relatively small size and an adjustable frequency. The radio-frequency isolator comprises a housing, a circuit board, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L1, an inductor L2, an inductor L3, an inductor L4, a first conductor, a second conductor and a third conductor, wherein the first conductor, the second conductor and the third conductor all are provided with rectangular cut-outs. The technical effects of the relatively small size and the adjustablefrequency of the radio-frequency isolator are achieved.