The invention discloses a Z-shaped slewing bearing device including an upper housing washer, a lower housing washer, rolling balls, pin rollers and a compression ring. The axis of the upper housing washer is coincident with that of the lower housing washer, the upper housing washer and the lower housing washer are nested together through step surfaces which are contacted with each other, and two opposite Z shapes are respectively formed on longitudinal sections passing through the axes; an upper annular roller path, a middle annular roller path and a lower annular roller path are arranged between the upper housing washer and the lower housing washer from top to bottom and are successively respectively provided with the upper roller path pin rollers, the rolling balls and the lower roller path pin rollers; the upper annular roller path and the lower annular roller path are respectively provided with tilted angles having opposite directions; the compression ring is arranged above the upper roller path pin rollers; the upper housing washer is provided with a plurality of fixing screws for fixing the compression ring, and the outer surface of the upper housing washer or the inner surface of the lower housing washer is provided with gear teeth. While the axial bearing ability of a slewing bearing is greatly improved, the slewing bearing still has quite strong abilities of bearing radial direction and capsizing direction loads; and the slewing bearing has a certain clearance self adjusting function, thereby improving the slewing bearing precision, enhancing the stability, and reducing noise.