Abstract: For improving the oxygen utilization rate of the positive pressure oxygen respirator and making the human body breathe more comfortable, an intelligent positive pressure oxygen respirator was designed, which can automatically regulate the oxygen supply according to the requirement of the human body. In this paper, the working principle of the intelligent oxygen breathing system and the intelligent oxygen supply device was described, the breathing resistance of the intelligent oxygen respirator, the residual pressure in the oxygen cylinder, the temperature of the inhaust and the CO₂ concentration in the inhaust were all tested. The tests showed that the breathing resistance difference of the intelligent oxygen respirator became smaller, the breathing resistance curve became much smoother, the oxygen consumption of the respirator was less and its service time was much longer.