The utility model belongs to the technical field of power cables. The utility model relates to an automatic die opening and closing mechanism for rubber coating and spraying of a high-voltage electrified overhead bare conductor robot. Wherein the lower part of the fixed seat is hinged and the upper part of the fixed seat is open; the arc-shaped clamping arms are fixedly arranged on the two sides of the fixed seat; the arc-shaped injection molding pressing rings are fixedly connected with the clamping arms respectively; a plurality of injection molding holes are uniformly formed in the injection molding pressing ring; a through hole is formed in the middle of the fixed seat; a cam is movably installed in the through hole, a connecting rod is fixedly installed on the cam, two rocking handlesare fixedly installed at the free end of the connecting rod, clamping blocks with grooves formed in the middles are fixedly installed on the inner sides of the clamping arms respectively, and the problem that in the prior art, a cable fixing device is not suitable for an operator to open, close and fix a bare wire on the ground is solved.