The invention discloses a low-cost radiofrequency coaxial connector, which comprises an outer conductor, an inner conductor and an insulator, wherein the insulator arranged between the outer conductor and the inner conductor is made of a plastic material PBTG20; two matched spring pieces and a rod body are arranged in the inner conductor; the spring pieces are connected to the front end of the rod body; and the two matched spring pieces construct an insertion-pull region. The low-cost radiofrequency coaxial connector has the advantages of low manufacturing cost, easiness for processing and stable product performance.