PURPOSE: A heat treatment device for manufacturing an aluminum alloy sheet is provided to prevent an inflow of steam into a heating furnace in a quenching process and a temperature drop of the heating furnace caused by an inflow of external air when opening a lower slide door. CONSTITUTION: A heat treatment device for manufacturing an aluminum alloy sheet comprises a heating furnace(20), a lifting roof(50), an alloy sheet jig(60), and a lifting unit(70). The heating furnace heats an aluminum alloy sheet for solution heat treatment of the aluminum alloy sheet. Air moved by the suction force of a circulating fan(40) penetrates an upper opening of the lifting roof. When the lifting roof is arranged in the upper part of an internal chamber(30), internal air of the internal chamber flows into a circulation fan. The lifting roof covers a lower opening of the heating furnace when the lifting roof is arranged in the lower part of the internal chamber so that a flow of heat and steam into/out of the heating furnace is secluded. The alloy sheet jig fixes the aluminum alloy sheet. The alloy sheet is lifted between the heating furnace and a cooling tank(90) so that the solution treatment and the quenching treatment of the aluminum alloy sheet are processed.
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