The invention discloses modified polymer mortar for integrated modification of earthquake resistance and energy saving of wall bodies and a preparation method. The modified polymer mortar is preparedfrom the following components in parts by weight: 800 to 1000 parts of common silicate cement (Class 42.5), 400 to 600 parts of water, 1300 to 2300 parts of sand, 7 to 25 parts of PVA (polyvinyl alcohol) fiber, 10 to 40 parts of fly ash floating bead, 30 to 140 parts of verified microspheres, 40 to 110 parts of microsilicon powder, and 8 to 12 parts of water reduction agent. The modified polymer mortar has the advantages that the proportional ratio of the components of the raw materials is reasonably selected; by stirring, plastering and forming, a whole structure is formed together with the brick and stone masonry wall surface and reinforced bars; while the earthquake resistance property of the wall body and the whole stability are improved, the heat drag of the wall body is obviously increased, the heat conduction coefficient is reduced, and the energy-saving effect of the building is realized.