The invention discloses a combined breathing valve. An air inlet rod extends out from the lower end of a combined breathing valve body and is connected with a high-pressure air steel bottle for providing high-pressure air for the combined breathing valve body; a high-pressure cavity is formed in the combined breathing valve body and connected with the air inlet rod; a high-pressure inflating connector and a pressure gauge are distributed and arranged on the positions, on the two sides of the high-pressure cavity, of the valve body, and both communicate with the high-pressure cavity; and a high-pressure safety valve is further arranged in the part, on the same side of the high-pressure inflating connector, of the combined breathing valve body, an exhaust channel is further formed in the part, on the same side of the pressure gauge, of the combined breathing valve body, an exhaust alarm whistle is arranged in the exhaust channel, and both the high-pressure safety valve and the exhaust channel communicate with the high-pressure cavity. According to the combined breathing valve, the high-pressure air steel bottle can be inflated, medium-pressure air outlet control is conducted throughcooperation of an opening-closing needle rod and an opening-closing needle rod plug pin, convenience and reliability are achieved, and operation is convenient.