The invention relates to replaceable cap glasses for electric power overhaul. The replaceable cap glasses comprise a shell, a guide rail shell and glasses, the inner surface of the shell is semi-spherical, the guide rail shell comprises a guide rail shell body, glasses slots, sliding slots, an inlet hole and an extension hole, the guide rail shell body is arranged inside the shell and matched with the shell, the glasses slots are formed in the guide rail shell body, the inlet hole is formed in one end of the lower surface of the guide rail shell body, the extension hole is formed in the other end of the lower surface of the guide rail shell body, the sliding slots comprise guide rail slots, inlet slots and extension slots, the guide rail slots are formed in the inner surface of the guide rail shell body, are annular around the axis of the guide rail shell body and penetrate the glasses slots, the inlet slots are formed in one end of the inlet hole in the inner surface of the guide rail shell body and penetrate the glasses slots, the extension slots are formed in the other end of the inner surface of the guide rail shell body and close to the extension hole, penetrate the glasses slots and do not penetrate the extension hole, the glasses comprise lenses and sliders and are matched with the glasses slots, and the sliders are matched with the sliding slots. The replaceable cap glasses have the advantages that the replaceable cap glasses can be simply and conveniently stored and replaced and are not easy to wear, and the bridge of a nose does not bear force.