The utility model belongs to the field of iron-making blast furnaces, and particularly relates to an inverted-cone-shaped long-service-life hearth structure. The furnace hearth comprises a furnace shell, a refractory material layer is arranged in the furnace shell, the outer wall, located at the bottom of the furnace hearth, of the refractory material layer is of an inverted-cone-shaped structure,the outer wall, located at the top of the furnace hearth, of the refractory material layer is of a regular-cone-shaped structure, the shape of the furnace shell is matched with that of the outer wallof the refractory material layer, and the refractory material layer is stably supported. The hearth has the advantages that the refractory material layer at the bottom of the hearth is arranged to beof the inverted-cone-shaped structure, so that the distance between the elephant foot area of the hearth and the cooling structure outside the refractory material layer is relatively uniform, molteniron solidification isotherm can be pushed towards the interior of the hearth, elephant foot-shaped erosion is effectively weakened or prevented, and the service life of the hearth is prolonged.