The invention relates to a cable connector. The cable connector includes a metal shell, a conductive terminal and a lead, wherein the metal shell is provided with an accommodation cavity; the conductive terminal is provided with a front end outside the metal shell, and a back end extending into the accommodation cavity; the lead extends into the accommodation cavity and is connected with the back end of the conductive terminal; the cable connector also includes a terminal sealing ring which sleeves the conductive terminal; the metal shell is provided with an expansion slot at the front end of the accommodation cavity, and the expansion slot expands to the outside; and the terminal sealing ring includes a sealing part which is accommodated in the expansion slot, thus having high sealing effect.