At present,there is still a certain gap in performance between commercial electrochemical carbon monoxide sensors in China and international products. Therefore,an improved impregnation reduction method and microwave treatment technology were used to prepare nano platinum black catalysts. Electrodes were prepared through screen printing technology and assembled into a three electrode electrochemical carbon monoxide sensor. A series of key performances were compared and analyzed with similar products of international high-end brands,including the sensor's response characteristic,gas linearity,temperature characteristics and high concentration operation stability. The results show that the prepared sensor has fast response speed,excellent linearity,temperature characteristics,and high concentration operation stability,and its performance reaches or approaches the advanced level of similar products.