The utility model discloses an adjustable bearing support which comprises a first portal frame structure, a second portal frame structure, a cross beam, a first idler wheel assembly, a second idler wheel assembly and a plurality of oil cylinders, the second portal frame structure is fixedly connected to an operation platform and is perpendicular to the operation platform, and the first portal frame structure is fixedly connected with the second portal frame structure. A first oil cylinder and a second oil cylinder which are vertically arranged are arranged on the inner wall of the upper end ofthe second portal frame structure, the bottoms of the first oil cylinder and the second oil cylinder are fixedly connected with the second portal frame structure, and the tops of the first oil cylinder and the second oil cylinder are fixedly connected with a cross beam arranged on the first portal frame structure in a sleeving mode and used for pushing the cross beam to move up and down along thefirst portal frame structure; a first roller assembly and a second roller assembly are arranged on the cross beam, and the first roller assembly is connected with a third oil cylinder which is horizontally arranged and used for pushing the first roller assembly to move in the horizontal direction. The connecting structure is reasonable in structural design, safe, reliable, convenient to disassemble and assemble and reliable in strength. When the three oil cylinders act, a connected object can be effectively adjusted up and down and left and right.