The invention relates to a replacement-free bar-shaped suspension type line composite insulator, wherein an upper accessory system is arranged on a grounding electrode of the insulator, a lower accessory system is arranged on a conductive electrode of the insulator, and at least one intermediate accessory system is arranged on an insulating part between the grounding electrode and the conductive electrode of the insulator; the upper accessory system is composed of an upper insulating part and an upper conductive part, and the upper insulating part is in close contact with the upper conductive part; the lower accessory system is composed of a lower insulating part and a lower conductive part, and the lower insulating part is in close contact with the lower conductive part; and the intermediate accessory system is made of an insulating material. According to the invention, most of the grounding electrode and the conductive electrode are isolated from the external air, thereby eliminating the corona discharge probability of the electrodes and improving the initial corona voltage and the dry flashover voltage; the ultraviolet rays and the rain water are shielded, so the wet flashover voltage is improved, and the pollution flashover probability is reduced; and the insulating parts of the upper accessory system, the lower accessory system and the intermediate accessory system can replace the sheds of the original insulator. By adopting the invention, as long as the mechanical strength of the insulator does not change, the insulator does not need to be replaced.