The utility model relates to a novel efficient silicon controlled rectifier (SCR) denitration deamination/smoke mixing device. The novel efficient SCR denitration deamination/smoke mixing device comprises a smoke pipe (1) and is characterized in that a primary guiding device (2) is arranged in the smoke pipe, and a secondary guiding device (3) is arranged at the position on the back side of the primary guiding device (2) in the smoke pipe (1). The novel efficient SCR denitration deamination/smoke mixing device has the advantage that the device is simple in manufacture and installation, smoke in a flue passes through the primary guiding device and the secondary guiding device to form strong turbulent flow to enable ammonia and nitrogen oxide in the smoke to be completely mixed, ammonia and nitrogen oxide concentration distribution change in a region with 100% of cross section is smaller than +/-10%, the SCR denitration efficiency is improved, and ammonia escape rate is reduced.