A suction nozzle of a vacuum cleaner is provided to prevent the turbulence due to the air collision from occurring and reduce the noise generated in inlet hole of suction nozzle by installing an air curtain at the suction port. A suction nozzle of a vacuum cleaner is composed of: an injection nozzle for injecting air at the collided area of the outer air flowed through a suction port(22) at both sides of the suction nozzle to block the collision of the outer air. The injection unit contains an inlet hole(31) penetrated at the suction nozzle, an injection hole(35) formed at the front and rear of the side wall of the suction port; and a connection path(33) mutually communicating the inlet and injection holes. The injection unit injects the air with an air curtain shape having thin width. The injection hole is formed at the center of the side wall.
