The invention provides a lower jaw lifting frame, which comprises a frame body and a bracket component; the bracket component comprises a base and a stretching mechanism; the stretching mechanism comprises a first stretching rod and a second stretching rod; the first stretching rod crosses through the base and points to the frame body, and the second stretching rod is opposite to the first stretching rod; the second stretching rod is connected with a holding rod through a link rod mechanism, and the link rod mechanism comprises a short link rod and a long link rod; one end of the long link rodis fixed with one head of the holding rod, and the other end of the long link rod is hinged with the second stretching rod; one end of the short link rod is fixed with the other head of the holding rod, and the other end thereof is hinged with the long link rod. Compared with the prior art, the lower jaw lifting frame can completely replace the manual lifting and oropharynx air duct at present, thus the intravenous anesthesia is more comfortable, safer, labor-saving and higher in efficiency. The invention further provides a working method of the lower jaw lifting frame.