The invention relates to an electromagnetic shielding chamber with a metal template outer coating structure and a manufacturing technology of the electromagnetic shielding chamber. The electromagnetic shielding chamber is formed by splicing shield plates, wherein each shield plate comprises a steel template and riveting hooks; each steel template is of a plate-like structure; a plurality of rib plates are uniformly distributed on the end surface of one side of each steel template and a plurality of riveting hooks are correspondingly arranged on the end surface of the other side of each steel template; the riveting hooks are uniformly distributed corresponding to the rib plates; concrete is correspondingly poured at one side, provided with the riveting hooks, of each steel template to form one shield plate; and the plurality of shield plates are mutually spliced to form the shielding chamber. The steel templates and the concrete are integrally molded through the riveting hooks; the steel templates can be directly used through pouring the concrete; the thicknesses and the firmness of the shield plates of the shielding chamber are improved by using the concrete and the riveting hooks; the steel templates are directly connected with the concrete through pouring the riveting hooks; and the shielding chamber is spliced by welding the steel templates.