Provided is a casing for a lithium metal secondary battery including: a battery casing material; at least one releasable capsule attached at least partially or totally to the inner surface of the casing material to cover the inner surface of the casing material; and a release solution supported in the releasable capsule, wherein the releasable capsule includes a capsule coating film and a capsule inner space surrounded with the capsule coating film, the release solution is supported in the capsule inner space, and the release solution includes a release agent and a solvent. A lithium metal secondary battery including the casing and a method for manufacturing the same are also provided. It is possible to increase releasability of the negative electrode in a lithium metal secondary battery and to improve nail safety by using the releasable capsule according to the present disclosure.