Casing, this product is a kind of epoxy resin including metal conductor, described the metal conductor have connection thread hole center location Settings, as described in the metal conductor in epoxy resin inside the casing body, described the metal conductor shielding ring with the casing body set up between epoxy resin and fixed insert, described the metal conductor with epoxy resin casing body set up between the conductive layer, described in the epoxy resin casing internal filling body  An electromagnetic isolation layer is filled, and a shielding layer is arranged on the side wall of the epoxy resin casing body.  After the metal conductor and the epoxy resin are poured into shape, the effect of the conductive layer reduces the expansion coefficient between the metal conductor and the epoxy resin, there is no gap between the metal conductor and the epoxy resin, and the epoxy resin sleeve is not leaky, and the mechanical strength is guaranteed.  At the same time, under the action of electromagnetic isolation layer and shielding layer, the electric field can be effectively shielded when epoxy resin casing is used for high voltage connection, and the partial discharge performance can be improved.