Centering guiding rule for backrest wheel

The utility model relates to a backrest wheel centering guiding rule, and relates to the field of detection equipment. The device comprises a parallel ruler, a reference assembly and a horizontal assembly, one end of the parallel ruler is connected with the reference assembly, the other end of the parallel ruler is connected with a horizontal guiding ruler, the reference assembly comprises a connecting plate, the connecting plate is perpendicularly connected with the end, close to a reference wheel in a back wheel, of the parallel ruler, and the side, close to the reference wheel, of the connecting plate abuts against a pipeline connected with the reference wheel. The horizontal assembly comprises a horizontal guiding rule, the horizontal guiding rule is perpendicularly connected with the end, away from the reference assembly, of the parallel ruler, and the end, close to the adjusting wheel in the back leaning wheel, of the horizontal guiding rule abuts against the pipeline connected with the adjusting wheel.