This invention relates to a compound medium support coaxial connector including an inner conductor, an outer conductor and a medium support characterizing that the medium support is composed of two kinds of insulation medium materials, and one of which is Teflon and the other is a medium material of high mechanical strength, since the dielectric constants of the two insulation media of the connector are almost the same, the adhesive used in the current technology is eliminated and this kind of connectors can reduce the influence of sudden change of dielectric constant of medium materials effectly and reduce the leakage of electromagnet.