A molten material stirring system comprising: a stirring vessel configured to accommodate molten material; a stirring blade positioned inside the stirring vessel; a rotating rod to which the stirring blade is fixed; a cover disposed over the stirring vessel, the cover comprising a central hole configured to allow the rotating rod to extend therethrough; a plurality of hanging posts positioned a predetermined distance between an outer edge of the cover and the central hole; and a suspension system configured to impart a lifting force on the cover through the plurality of hanging posts, wherein the cover comprises a first cover member and a second cover member divided by at least one border region extending through the central hole and each of the hanging posts comprises a first post member and a second post member respectively positioned on the first cover member and the second cover member proximate the border region and configured to face each other, characterised in that: the first post member and the second post member are configured to be combined with or separated from each other; and the suspension system comprises: a holder which holds the first post member and the second post member together; a rail-type fixed frame positioned at an upper portion of the stirring vessel; a first moving frame configured relative to the fixed frame to be movable back and forth in a first direction; a second moving frame configured to be movable back and forth a predetermined distance in a second direction different from the first direction; and a link member of which a length is adjustable and which suspends the holder from the second moving frame. a stirring vessel configured to accommodate molten material; a stirring blade positioned inside the stirring vessel; a rotating rod to which the stirring blade is fixed; a cover disposed over the stirring vessel, the cover comprising a central hole configured to allow the rotating rod to extend therethrough; a plurality of hanging posts positioned a predetermined distance between an outer edge of the cover and the central hole; and a suspension system configured to impart a lifting force on the cover through the plurality of hanging posts, wherein the cover comprises a first cover member and a second cover member divided by at least one border region extending through the central hole and each of the hanging posts comprises a first post member and a second post member respectively positioned on the first cover member and the second cover member proximate the border region and configured to face each other, characterised in that: the first post member and the second post member are configured to be combined with or separated from each other; and the suspension system comprises: a holder which holds the first post member and the second post member together; a rail-type fixed frame positioned at an upper portion of the stirring vessel; a first moving frame configured relative to the fixed frame to be movable back and forth in a first direction; a second moving frame configured to be movable back and forth a predetermined distance in a second direction different from the first direction; and a link member of which a length is adjustable and which suspends the holder from the second moving frame. the first post member and the second post member are configured to be combined with or separated from each other; and the suspension system comprises: a holder which holds the first post member and the second post member together; a rail-type fixed frame positioned at an upper portion of the stirring vessel; a first moving frame configured relative to the fixed frame to be movable back and forth in a first direction; a second moving frame configured to be movable back and forth a predetermined distance in a second direction different from the first direction; and a link member of which a length is adjustable and which suspends the holder from the second moving frame. a holder which holds the first post member and the second post member together; a rail-type fixed frame positioned at an upper portion of the stirring vessel; a first moving frame configured relative to the fixed frame to be movable back and forth in a first direction; a second moving frame configured to be movable back and forth a predetermined distance in a second direction different from the first direction; and a link member of which a length is adjustable and which suspends the holder from the second moving frame.