Vault firing furnace capable of filtering and purifying flue gas

The utility model belongs to a vault firing furnace capable of filtering and purifying flue gas, and provides the following scheme that the vault firing furnace comprises a fixed seat and a feeding mechanism arranged on the outer wall of the fixed seat. The situations that scalding is prone to occurring due to manual feeding and the incineration efficiency is low are prevented, when feeding operation needs to be carried out on the interior of the incinerator, an operator can place a product body on a feeding table firstly, a driving motor is started, the product body passes through a feeding opening through movement of a feeding rod, and the interior of the incinerator is heated for incineration; the movement of the rotating rod drives the sliding column to slide along the inner wall of the concentric-square-shaped groove under the action of the first limiting groove, and further, the sliding of the sliding column drives the feeding rod to conduct reciprocating feeding operation on the product body, so that t