The invention relates to a preparation method for a silver-doped manganese dioxide aerogel with high mechanical strength, belonging to the field of catalyst preparation. The invention provides the silver-doped manganese dioxide aerogel with high mechanical strength. The manganese dioxide aerogel is doped by elemental silver, and the chemical components of the aerogel are as described in a general chemical formula Ag-K<2-x>Mn<8>O<16>, wherein x is more than 0 and less than 2. The invention further provides the preparation method for the silver-doped manganese dioxide aerogel with high mechanical strength. The silver-doped manganese dioxide aerogel prepared by using the preparation method has the advantages of high mechanical strength, large specific surface area and good conductivity; and the preparation method has the advantages of simple process, low cost, easiness in scale-up production and so on.