The invention discloses a method for preparing microporous tobacco powder by a complex enzyme process. The method comprises the following steps of preparing tobacco raw materials; crushing the tobaccoraw materials into powder, adding water to soak the tobacco raw material powder according to the mass ratio of the tobacco raw materials to water of 1 : 5 to 1 : 10, adjusting the pH value through asodium acetate buffer solution, and finally heating and stirring a mixed solution; adding a complex enzyme solution into the mixed solution, and carrying out an enzymolysis reaction; and after the enzymolysis reaction is finished, carrying out suction filtration, washing and drying on the mixed solution to obtain the microporous tobacco powder. The tobacco powder can be prepared into sheets to beapplied to low-temperature cigarettes; and the tobacco powder is treated with a complex enzyme, so that the adsorption performance of the tobacco powder to an atomizing agent and tobacco essences andflavors is enhanced, the blending space of the atomizing agent and the essences and flavors is expanded, the smoking taste added by a single tobacco sheet is improved, and the smoking taste of the low-temperature cigarettes is improved.