The utility model relates to an anti-noise and anti interference network adapter for branches, distribution and terminals of a coaxial cable, which is characterized in that an original single layer metallic shield outer case is increased to a multi-layer metallic shield outer case. The multi-layer shield case is alternately combined by a layer of paramagnetic materials and a layer of diamagnetic materials, and each layer of case bodies are mutually isolated but connected with each terminal port by a coaxial capacitor with high frequency. Each terminal port is connected with a transmission line transformer in series, the conductive bodies inside and outside a joint are both pressed and connected by fasteners, and the terminal adapter is provided with a coaxial balanced filter and a squelch switch. Therefore, the anti interference capability of the network adapter is fully improved.