The utility model provides a multicomponent gaseous pollutants monitoring devices based on non - dispersed infrared spectrum absorbs belongs to atmosphere environmental pollution monitoring field, and the device includes infrared light source module, strains aureola module, multiple reflection pond module, infrared detector module, DSP signal processing analysis module, the infrared module includes nichrome silky luster of mercerized cotton fabrics source and voltage regulator device, strain the aureola module and strain aureola and synchronous machine including what bear a plurality of light filters, multiple reflection pond module include three spherical mirror, admit air and exhaust control mouthful, heating and module with constant temperature, electric infrared detector is released including heat to the detector module, DSP signal processing analysis module includes multi -stage amplifiers and filtering processing, AD conversion, DSP data analysis, host computer and alarm module, the utility model discloses with low costs, simple structure, stability is good, sensitivity is high, and on -line monitoring and component and range are expanded simultaneously to have realized multicomponent gaseous pollutants.