According to the method for manufacturing a vermiculite sheet of the present invention, it is possible to improve the binder flow property to ensure a constant adhesive force, and to provide a support made of a perforated plate material between two vermiculite boards, thereby remarkably improving the durability of the vermiculite board. The vermiculite sheet has remarkably improved durability and water resistance, so there is no problem in use even in high-temperature environments and fire situations, and when used as a gasket, it is free from problems due to surface oxidation. Therefore, the vermiculite sheet according to the present invention has the above-mentioned characteristics. Therefore, it can be usefully used in various fields such as gaskets, interior and exterior materials of buildings, and electromagnetic wave shielding boards.
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