Respiratory therapeutic instrument

The utility model relates to a respiratory therapeutic instrument; a container communicated with a suction nozzle is composed of an adjustor used as an inner cavity, and a mixer used as an outer cavity. An adjustment valve used as a gas inlet and gas outlet is arranged on an upper cover of the mixer; the adjustor is communicated with the mixer by a gap between a top cover of the adjustor and the adjustor; expired gas of a patient is mixed with outside air, and then the patient sucks the mixed gas; the process is circulated and repeated. After the mixed gas is repeatedly sucked by a human body, and the mixed gas is sucked by blood; simultaneously, the utility model has obvious therapeutic effect to enhance the elasticity of vessel walls, and reduces and even eliminates a series of diseases of respiratory organs, cardio-cerebral blood vessel systems, digestive systems, muscle systems and skeletal systems, and diseases caused by smooth muscle spasm and tissue ischemia. The concentration of carbon dioxide sucked in the mixed gas can be adjustable with the utility model.