The utility model discloses a special high frequency signal metallic shield subassembly, including shielding band and fixed coat, the main part of shielding band is long band -shaped, is equipped withsquare opening in one side of shielding band, at the end of shielding band, the middle part of following width direction is equipped with a long banding breach, the shape of fixed coat corresponds with the shape of shielding band to sealed coating is equipped with a plurality of thread gluing in the outside of shielding band on the surface of fixed coat. The utility model provides a special highfrequency signal metallic shield subassembly novel structure, simple to operate, interference killing feature to special high frequency noise is stronger, is applicable to the special high frequency interference of partial discharge of the combined electrical apparatus of the different voltages of antagonism, and application scope is wide.