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This application relates to the field of hot molding processing technology, specifically a hot molding pre-assembly fixture and a hot molding pre-forming method. The hot molding pre-assembly fixture includes a central mold and side molds; a first anti-slip portion is provided on the first clamping surface of the central mold to increase the frictional force on the material layer in the web region; a second anti-slip portion is provided on the second clamping surface of the side molds to increase the frictional force on the material layer in the flange region; and the groove depth of the first anti-slip portion is greater than the groove depth of the second anti-slip portion. In this embodiment of the hot molding pre-assembly fixture, the first anti-slip portion can apply an effective dragging force to the material layer in the web region, causing the material layer to follow the mold movement and fully extend. The second anti-slip portion allows for a differentiated matching relationship between the frictional resistance of the side mold to the material layer in the flange region and the frictional driving force of the central mold to the material layer in the web region. This depth difference helps to limit unintended slippage of the material layer in the flange region during the molding process.