The utility model relates to a diamond-shaped hydraulic support for a pitching oblique mining working face in steeply inclined seams. The diamond-shaped hydraulic support is characterized in that the hydraulic support consists of a roof beam, a base, a shield beam, a four-bar stabilizing mechanism and two upright columns, wherein the four-bar stabilizing mechanism is divided into a front part and a rear part; the two upright columns are staggered fore and aft; both the roof beam and the base of the support are of diamond-shaped structures; the rear end of the roof beam is hinged with the shield beam; and the shield beam is hinged with a connecting rod and the base, and is divided into a left part and a right part which are adaptive to the roof beam and four rods. The diamond-shaped hydraulic support for the pitching oblique mining working face in the steeply inclined seams is adjustable in whole center distance along with the chute of a conveyor, is simple and compact in structure, is light in weight and favorable for moving and transportation, has the functions of supporting side surrounding rocks and the roof plate of the working face, and belongs to hydraulic supports for shielding and supporting.