A quick demountable high-reliability radio-frequency coaxial connector including a front shell and a rear protective jacket, a cavity of the front shell is internally provided with a front insulator and a central conductor, a first locating hole of a central axial position of the front insulator, the center of the front end of the central conductor is provided with a front protrusion, the front protrusion is arranged towards the first locating hole, a penetration hole is formed in a central part of the axial tail of the central conductor, the axial tail is a necking conical structure, the inner diameter of the outer end of the necking conical structure is smaller than that of an inner conductor of a cable, and meanwhile, the inner diameter of the inner end of the necking conical structure is larger than that of the inner conductor of the cable.
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