Packing box for glass substrate

PURPOSE: A glass-substrate packing box is provided to extend the lifetime of a product since a support block, which has been damaged by the contact with the glass substrate, can be easily replaced. CONSTITUTION: A glass-substrate packing box comprises a body(110) and a support block(120). The body comprises a space(111), which is formed on one side of the body and has a larger area than the glass substrate, and an assembling groove(113) is formed on the inner surface of a sidewall(112), which covers the space, in a depth direction of the space. The support block comprises an inserting part(121), which is formed on one end of the support block and is detachably connected to the assembling groove of the body and a support part(122), which supports the lateral end of the glass substrate, is formed on the other end of the support block.