The invention discloses a two-stage side guard transition bracket for a large height mining face, comprising a box-shaped upper side plate welded on one side of a bracket top beam, a lower side plate hinged on the lower edge of the box-shaped upper side plate, and a telescopic jack arranged between the box-shaped upper side plate and the lower side plate, wherein a shield beam large side plate iswelded on a shield beam arranged on one side of the box-shaped upper side plate, the front part of the shield beam large side plate is linked with the box-shaped upper side plate and the lower side plate, a top beam movable side plate and a shield beam movable side plate are respectively hinged on the other sides of the bracket top beam and the shield beam and are respectively connected to the top beam and the shield beam through a side thrust jack. The two-stage side guard transition bracket has the advantages that the safety guard for a region with large support height drop between a middlebracket and an end bracket of the mining face is realized, coal in triangle areas on the tops of two tunnels of the large height mining face is effectively mined, and the coal recovery rate is improved.