The invention discloses a preparation method of a composite aerogel type cigarette filter material, belonging to the technical field of preparation of filter materials. The preparation method comprises the following steps: mixing sepiolite with an organic acid solution, carrying out ultrasonic immersing, carrying out concentration under reduced pressure, carrying out drying, carrying out roasting,thus obtaining pretreated sepiolite, enabling the pretreated sepiolite to react with organic alkali, carrying out concentration under reduced pressure, carrying out drying, thus obtaining modified sepiolite, adding carbomer, phospholipid and carrageenan into water, carrying out ultrasonic dispersion, adding glycoprotein, carrying out constant-temperature stirring reaction, thus obtaining a mixedsolution, stirring the modified sepiolite and the mixed solution at constant temperature, injecting the obtained mixture into a mold, carrying out low-temperature precooling, carrying out vacuum freeze drying, and carrying out demolding, thus obtaining the composite aerogel type cigarette filter material. The composite aerogel type cigarette filter material prepared according to the technical scheme provided by the invention has the excellent adsorption property, has the obvious adsorbing effect for hazardous substances in cigarettes, has good mechanical property, and can reserve the fragranceof the cigarettes.