Portable automobile tail gas detection instrument

The utility model discloses a portable automobile tail gas detection instrument which comprises a main controller, an NDIR (Non-Dispersive Infrared Analyzer) four-channel three-component gas analyzing module, an oxygen and nitrogen oxide sensor and a pressure and flow sensor, wherein the main controller is provided with a keyboard. The device disclosed by the utility model can be used for carrying out on-line real-time detection on the components of a tail gas, such as HC, CO, CO2, NOx and O2; and in addition, the device disclosed by the utility model has the advantages of compact structure, portability and accurate detection result and can be used for detecting various components contained in the tail gas in practical application, thereby overcoming the defect that the current domestic automobile tail gas detection instrument can be used for only detecting CO and HC gases.