Integrated flue gas denitration device

The utility model discloses an integrated flue gas denitration device which comprises a denitration pipeline, a plurality of slots are formed in the outer wall of one side of the denitration pipeline, connecting blocks are inserted into the inner walls of the slots, a plurality of catalyst placing screen plates are fixed to the outer walls of one sides of the connecting blocks, a heat absorption box is fixed to the inner wall of the denitration pipeline, and circulating water coils are arranged on the inner walls of the two sides of the heat absorption box respectively. A water guide pipe is fixed to the outer wall of the top of the circulating water coil and penetrates through the outer wall of the top of the denitration pipeline, a smoke exhaust pipe is arranged on the outer wall of the top of the denitration pipeline, a gas guide pipe is fixed to the outer wall of the bottom of the denitration pipeline, a connecting pipe is fixed to the outer wall of the bottom of the gas guide pipe, and a filter screen is