The invention discloses an automobile steering transmission mechanism. The automobile steering transmission mechanism comprises a steering gear which is in transmission connection with a steering wheel, wherein the steering gear comprises a housing; a steering screw is arranged in the housing; a threaded section is arranged on the steering screw; a spiral groove I is formed in the outer peripheral wall of the threaded section; a steering nut is arranged on the threaded section of the steering screw in a sleeving manner; a spiral groove II is formed in the inner peripheral wall of the steering nut; spiral channels are formed between the spiral groove I and the spiral groove II; steel balls are arranged in each of the spiral channels; steel ball ducts are arranged in the steering nut; clamping teeth are arranged at one end of the steering nut; a steering rocker arm shaft perpendicular to the steering screw is arranged in the housing; a toothed sector meshed with the clamping teeth is arranged on the steering rocker arm shaft; a sealing ring I is arranged between the housing and one end extending out of the housing, of the steering screw; a sealing ring II is arranged between the housing and one end extending out of the housing, of the steering rocker arm shaft; and a preload adjuster is correspondingly arranged at the other end of the steering rocker arm shaft and in the housing.