The invention relates to an isolator which obstructs DC signals and low-frequency signals and allows passing of radio frequency signals. The ground current isolator of the radio frequency signals comprises a first coaxial connector and a second coaxial connector which are connected with each other. A first insulator of the first coaxial connector is located in a first shielding layer, and a second insulator of the second coaxial connector is located in a second shielding layer. One end of the second shielding layer has an intersected superposed segment with the first shielding layer. The superposed segment between the first shielding layer and the second shielding layer is provided with a clearance which is internally provided with a conductive medium layer. The ground current isolator for the radio frequency signals provided by the invention is simple in structure simple in assembly process, high in production efficiency and low in cost. The ground current isolator settles the technical problems in the prior-art isolator such as complicated structure, difficult assembling process, high precision requirement, low production efficiency and higher cost.