The invention relates to a preparation method for aerogel. The preparation method for aerogel overcomes the technical problem that the pore size of conventional macroporous silica gel is not large enough. The preparation method comprises the following steps: (1) primary treatment of an aerogel raw material with a special solution; (2) primary acid dipping; (3) secondary treatment with the special solution; (4) secondary acid dipping; and (5) drying so as to obtain the aerogel product; wherein the special solution is one selected from a group consisting of methanol, glycol and glycerol. The preparation method is extensively applicable to the field of preparation of aerogel.