Fixing device for carbon dioxide detector

The utility model discloses a fixing device for a carbon dioxide detector. The detector comprises a mounting plate, a detector main body and a first connecting plate, a second connecting plate is arranged on the surface of the left side of the mounting plate; a first connecting plate is inserted into the second connecting plate; a mounting hole is formed in the first connecting plate; and a firstconnecting column is inserted into the mounting hole, the right side of the first connecting column is connected with a first baffle, the right side of the first baffle is connected with a spring piece, the surface of the first baffle abuts against a first clamping cavity, a second clamping cavity is formed in the left side of the mounting plate, and a first spring is inserted into the second clamping cavity. By arranging the second connecting plate and the filter screen, dust in air can be conveniently filtered, and by arranging the first connecting column and the first baffle, the position of the detector main body