The invention discloses a steel-structure air conditioner bracket. The steel-structure air conditioner bracket comprises a fixed base fixedly connected to a wall body, and a supporting base used for placing an air conditioner external unit, wherein the fixed base is fixedly connected to the supporting base; an included angle between the plane on which the fixed base lies and the plane on which the supporting base lies is greater than 100 degrees; the end part of one end, far away from the fixed base, of the supporting base is provided with a bulge; a supporting part is arranged below the supporting base; the supporting part is fixedly connected to the supporting base and the fixed base respectively; a transverse bracket is mounted above the supporting base; a rubber pad is arranged on the upper surface of the transverse bracket; a telescopic frame is mounted at the upper end of the fixed base; the telescopic frame is fixedly connected to a shielding plate by virtue of a bolt; the shielding plate and the supporting base are in parallel arranged; and the periphery of the shielding plate is provided with a baffle plate perpendicular to the periphery. The steel-structure air conditioner bracket is simple in structure, is convenient to dismount, is firm in structure, capable of effectively preventing rain and snow invasion and solarization, and capable of prolonging the service life of the air conditioner bracket.