The present disclosure discloses a package box device for liquid crystal panels, comprising a rectangular box for accommodating liquid crystal panels, wherein an inside surface of said rectangular box is an inclined inside surface, and an inside surface opposite to said inclined inside surface of said rectangular box is provided with a detachable member; and wherein said detachable member is constructed so that after said detachable member is installed, said detachable member protrudes toward said inclined inside surface to fix liquid crystal panels to be transported; and after said detachable member is detached, the upper opening of said rectangular box becomes larger to facilitate removal of said liquid crystal panels out of said rectangular box. The liquid crystal panels can be fixed well in the device during transportation process, and can be removed from the device more easily when necessary.