Blast furnace bottom

The invention provides a blast furnace bottom. The blast furnace bottom comprises a furnace shell steel plate, a first-stage sealing plate, a second-stage sealing plate, a blast furnace foundation, a sealing device, a liquid supply device, a cooling layer, a fire-resistant layer and a concrete foundation pier, wherein the second-stage sealing plate is arranged on the blast furnace foundation; the furnace shell steel plate is erected on the second-stage sealing plate to form a sealed shell, and the inner wall of the furnace shell steel plate makes contact with the outer wall of a baffle; a sealing device is arranged on the periphery of the bottom of the furnace shell steel plate in a surrounding mode, and the liquid supply device is connected with the sealing device through an electromagnetic control valve; the concrete foundation pier is arranged on the second-stage sealing plate, and the fire-resistant layer is arranged on the upper layer of the concrete foundation pier; the first-stage sealing plate is arra