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In view of high production cost of gas alarm in the present market and the problem that there is no corresponding automatic processing function when gas leakage is detected, this paper has put forward a scheme of multipoint automatic detection, automatic alarm and automatic air exhausting device, and has designed the wireless transmission circuit with more testing points and automatic alarm and air exhausting circuit. In order to realize wireless transmission, this paper has designed the sending and receiving procedures for wireless transmission, and made simulation and analysis on the automatic alarm and automatic exhaust device circuit for gas leakage through software simulation tools. Experimental results show that based on the same requirement of the carbon monoxide detect index, only selecting the carbon monoxide sensor with the relatively poor performance, gas leakage automatic alarm and automatic exhaust device hardware circuit can detect leakage signal of carbon monoxide. The experimental conclusion proves that the use of multi-point automatic detection and alarm measures reduced the demand for the sensor performance, and then achieved the purpose of reducing costs, and automatic exhausting function enhanced the comprehensive performances of alarm.