The invention discloses a car carrier crawling ladder with a main body of an n-shaped structure. The car carrier crawling ladder comprises a first supporting plate, wherein two ends of the first supporting plate are respectively connected with a second supporting plate in a welding manner, a third supporting plate is arranged between one side walls, close to each other, of the second supporting plates in a rotating manner, one side wall, away from the first supporting plate, of the third supporting plate is welded with first connecting plates which are symmetrically arranged, one end, away from the third supporting plate, of the first connecting plate is provided with a groove, a second connecting plate is arranged between two side walls of the groove in a sliding manner, one side wall ofthe second connecting plate is provided with a first through hole, one side wall of the first through hole is connected with a rack, one side wall of the first connecting plate is connected with a driving motor, the output end of the driving motor is connected with a rotating shaft, and one end of the rotating shaft away from the driving motor penetrates through the first through hole and extendsinto a second groove. The angle of the crawling ladder can be adjusted according to the height of a chassis of different cars, so that the collision of the car in the process of driving onto a carriage can be prevented, and the practicability is improved.