The utility model relates to a breathing machine for severe case emergency treatment, which comprises a breathing mask, and the breathing mask comprises a conical mask body and a nose oxygen conveyingpart arranged on the conical mask body; wherein the conical mask body is provided with a mask surface attached to the face, the left side and the right side of the mask surface are both provided withmask rings arranged oppositely, elastic bandages are installed on the mask rings, the nose oxygen conveying component comprises an oxygen introducing pipe arranged on the conical mask body and provided with a sealed end and side pipes arranged on the two sides of the oxygen introducing pipe, and a corrugated pipe is arranged on each side pipe; the oxygen supply device is used for critical patients, can supply oxygen to the nose and the mouth at the same time, is comfortable to wear, can adjust the oxygen supply flow, can be manually pressed for oxygen therapy, and is convenient to operate andsimple to use.