The invention provides a production method of fermented fructus crataegi flavor. The production method includes the steps of firstly, mixing fructus crataegi powder with water according to mass ratio of 1:(10-40), extracting at 60-75 DEG C for 3-5 hours, performing suction filtration, repeatedly extracting filter residues for 2-3 times, combining filtrate, and sterilizing; secondly, performing activated culture on Bacillus methylotrophicus J4-1 to obtain Bacillus methylotrophicus activated liquid; thirdly, fermenting, to be more specific, inoculating the Bacillus methylotrophicus activated liquid into the combined fructus crataegi filtrate obtained in the first step according to the volume ratio of 5-20% to form fermentation broth; fourthly, performing vacuum concentration on the fermentation broth obtained in the third step at 55-65 DEG C until relative density is 1.2-1.3, performing precipitation on the concentrated fermentation broth and 95% ethanol according to the mass ratio of 1:(3-4) overnight, then performing suction filtration, and performing vacuum distillation on filtrate to remove solvent so as to obtain rufous extract, namely the fermented fructus crataegi flavor. The fermented fructus crataegi flavor can increase the fragrance of reconstituted tobacco, lower stimulation and reduce offensive odor.