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This utility model relates to the field of refractory materials technology for metallurgical equipment, and in particular to a ladle tank bottom lining structure with a gradient thickness, including ladle nozzle seat bricks, vertically laid tank bottom bricks, and lining wall bricks. The vertically laid tank bottom bricks include center bricks, intermediate bricks, and edge bricks, which are laid in a ring from the ladle nozzle seat bricks towards the edge of the ladle tank bottom, with the thickness d of the center bricks, intermediate bricks, and edge bricks increasing by 30mm to 40mm respectively. The lining wall bricks are set at the bottom of the inner wall of the ladle tank and connect with the edge bricks, with the thickness e of the lining wall bricks decreasing by 15mm to 20mm from bottom to top. The beneficial effects of this utility model are: by optimizing the thickness distribution, it improves thermal shock resistance, structural stability, and service life, and increases the steel loading capacity.