The invention discloses a supporting and protecting device of a large obliquity thick coal bed leaving small coal pole along the roadway driving, which comprises an outrigger, a triangle fixing bracket, a supporting leg brace and a fixing anchor. The outrigger is I-shaped, and a triangle fixing bracket is welded on the top and the bottom ends of the outrigger. The fixing anchors of the top and the bottom ends of the outrigger pass the anchor hole on the triangle fixing bracket. One section of anchor enters the roadway top and the stable terrane of the soleplate, and the other end is hung with a splint which fixes the top and the bottom ends of the outrigger on the roadway coal wall to form a strong supporting and protecting whole together with the metal net, the high-strength pre-stress anchor and the metal band. The materials of the device can be easily gained, the construction is easy, and the supporting and protecting are safe and reliable, thus effectively improving the reliability and safety of the whole support and protection, solving the roadway supporting and protecting technological problem of large obliquity thick coal bed, producing good effect that prevents the coal bed from sliding, and providing high practical value.