The invention discloses a sliding rail mechanism suitable for adjusting roller shutters of household doors and windows. The sliding rail mechanism comprises an adjusting sliding rail which comprises asliding rail base, and sliding rail baffles which are parallel mutually are fixedly welded to the surface of the sliding rail base; a rail is formed between the two sliding rail baffles, ball fixed cavity channels are formed in the inner sides of the sliding rail baffles, and a plurality of semi-spherical rolling cavities for holding balls are movably formed in the ball fixed cavity channels at equal intervals; and the two ends of a longitudinal adjusting plate and a transverse adjusting plate are mounted in the rail correspondingly, and the upper sides and the lower sides of the longitudinaladjusting plate and the transverse adjusting plate make contact with the balls. The transverse adjusting plate and the longitudinal adjusting plate mounted between the sliding rail baffles can slidefreely through free rotating of the balls in the semi-spherical rolling cavities.