The utility model discloses an N2O gas enriching and sampling system which comprises an enriching box, a filter box communicated with the enriching box is arranged on the upper surface of the enriching box, a filter element is embedded into the front surface of the filter box in a sliding mode, and fixing blocks are fixedly connected to the positions, located on the upper surfaces of the two sides of the filter element, of the front surface of the filter box. And an air inlet piece is arranged on the upper surface of the filter box. The utility model relates to the technical field of N2O gas treatment, and discloses an N2O gas enrichment sample introduction system, which is characterized in that the back ends of two convex blocks are fixedly connected with two side surfaces in a cavity plate through springs, the upper surfaces of the two convex blocks are vertically and rotatably connected with adjusting blocks corresponding to positioning blocks, and rotary knobs are rotated to drive elliptic blocks to rotate, so that the concentration of the elliptic blocks is realized. And under the elasticity of the spring, the elliptical block can extrude the two sliding plate blocks when rotating, and the adjusting block on the convex block can enable the upper end of the positioning block to be separated from the through groove in the fixing block, so that the filter screen can be rapidly disassembled, and the filter screen is convenient and rapid to disassemble.
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