The invention discloses an automobile safety belt fixator which comprises a bag body (1) in the form of right trapezoid, wherein the two bottom sides of the bag body (1) are provided with openings; the relatively long bottom side of the bag body (1) is movably provided with a plurality of fixing parts (2) for connecting the openings; and an accommodating bin (3) is formed in the right-angled waist of the bag body (2). The fixing parts (2) comprise buckles. The buckles comprise a partition buckle (5) arranged above the fixed safety belt (4) and a plurality of regulating buckles (7) for regulating the position of a movable safety belt (6). The automobile safety belt fixator can be suitable for using requirements of children of all ages, is high in safety, and can meet the sleep-use needs of children.