Fire observation hole device and kiln

The utility model discloses an observation hole device and a kiln, the observation hole device comprises a precast block and a plurality of fixing pieces, each fixing piece is fixedly connected with the outer wall of the kiln body, the space enclosed by each fixing piece is used for accommodating the precast block, the side surface of the precast block is provided with a groove, the shape of the groove is matched with the shape of the fixing piece, and the fixing pieces are fixedly connected with the precast block. And the fixing piece can be arranged in the groove. During construction, all the fixing pieces are fixedly connected to the outer wall of the furnace body, the precast block is placed in the space defined by all the fixing pieces, all the fixing pieces are arranged in the corresponding grooves in the side faces of the precast block, and therefore the precast block is installed on the furnace body. The fixing pieces are fixedly connected with the outer wall of the furnace body and fix the prefabrica