Gas concentration alarm

The utility model discloses a micro-power consumption gas concentration alarm adopting the MEMS technique. Aiming at the defects in the prior art that the response time of the product is long and the applicable scope is not extensive, the gas concentration alarm comprises a concentration sensor detection module, a control module and an alarm main body. A primary instrument is formed by the concentration sensor detection module to obtain original signals; a secondary instrument is formed by the control module and the alarm main body; and the concentration sensor detection module comprises an MEMS concentration sensor comprising an MEMS concentration sensor chip, a corrosion control base plate and a detection cover. Compared with the prior art, the utility model has the advantages of good compaction degree, high strength, good toughness, strong shock resistance, simple and uniform structure, and wide application scope.