A jewelry storage device includes a box body unit and a locking unit. The box body unit includes a first body, and a second body, wherein a plurality of first and second connecting members are formed at rear sides of the first and second bodies respectively and are coupled with each other to pivotally connect the first body with the second body. The locking unit includes a mortice lock member and a locking member provided at front sides of the first and second bodies respectively in a hidden manner. The first and second connecting members are not protruded from the rear sides of the first and second bodies respectively. The mortice lock member and the locking member are not protruded from the front sides of said first and second bodies respectively. Therefore, the box body unit has no protruded portion formed at the first and second bodies.