The present invention relates to a nitrogen oxide treatment apparatus equipped with a nozzle cleaning device capable of cleaning nozzles contaminated by foreign substances in a pipe by a reciprocating motion of a brush, and a moving member inserted into the inside of a connecting pipe by the operation of the main cylinder In the nitrogen oxide treatment apparatus for cleaning the inside of a pipe by moving the nozzle to the left and right, the connection pipe is coupled with an installation part, and a moving block that moves back and forth by the operation of an auxiliary cylinder is provided inside the installation part. The movable block proposes a nitrogen oxide treatment apparatus equipped with a nozzle cleaning device, characterized in that a brush for cleaning the surface of the nozzle is coupled to the movable block. Accordingly, the present invention prevents contamination of the nozzle due to the deposition of foreign substances in advance by periodically cleaning the surface of the nozzle by a brush configured to be moved back and forth repeatedly by the auxiliary cylinder, thereby enabling uniform spraying at all times. It has the effect of prolonging the life of pipes and equipment such as boilers. In addition, by adding a nozzle cleaning device of a simple configuration to the existing nitrogen oxide treatment device, manufacturing cost and assembly cost are reduced, so that it is more economical and easier to maintain.
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