The utility model discloses an automatic generating device of particulate matter pollutant, storing the storehouse including sealed shell body and the comburent that is located the shell body, being equipped with air intlet and exhaust hole on the shell body, the bottom that the storehouse was stored to the comburent is equipped with the stock guide that the slope set up, and the below that the storehouse was stored to the comburent is equipped with the guiding groove of storing the storehouse intercommunication with the comburent, and one side of guiding groove bottom is equipped with lights the mechanism, the guiding groove bottom and light the relative one side of mechanism and be equipped with the pipe of discharging fume, discharge fume the pipe with exhaust hole intercommunication. The utility model discloses an automatic generating device of particulate matter pollutant can be automatic, continuous production comburent flue gas, put into the comburent with the comburent and store the storehouse, the comburent will be automatically, the bottom of the entering guiding groove of order, then fire and collects the flue gas that produces from moving point, need not manual operation, so the uniformity of flue gas each item index of production is higher, provides necessary forebody condition for the air purifier testing result that obtains the accuracy.