An apparatus for shielding electromagnetic waves of 915 MHz industrial microwaves is provided to prevent microwave from leaking from the cavity to outside by a standardized choke. The rectangular frame(20) is fixed to the opening surface of the cavity(10). The cover net(31-1) is installed at the central part of the main panel. The choke of a plurality of rectangular shapes is installed along the end of the main panel. A plurality of chokes comprises the inner side cover. The one side of chokecover is adjoined in the rectangular frame. The other side face of chokecover is inserted in the choke. The side cover(50) is connected to the rectangular frame through the hinge.
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