The invention discloses an anti-cracking heat insulation mortar. The anti-cracking heat insulation mortar is prepared from the following raw materials in parts by weight: 35 to 50 parts of cement, 20to 30 parts of quartz sand, 10 to 15 parts of expanded perlite, 5 to 10 parts of hollow glass microbeads, 4 to 6 parts of rock powder, 3 to 7 parts of graphite powder, 2 to 5 parts of rice husk powder, 4 to 8 parts of clay, 3 to 5 parts of acrylate emulsion, 0.5 to 0.7 part of polypropylene fiber, 0.5 to 0.7 part of cellulose ether, and 1 to 2 parts of ammonium polyphosphate. The anti-cracking heat insulation mortar has the advantage that the cement, the quartz sand, the expanded perlite, the hollow glass microbeads, the rock powder, the graphite powder, the rice husk powder, the clay, the acrylate emulsion, the polypropylene fiber, the cellulose ether and the ammonium polyphosphate are used as the raw materials, are reasonably compounded, and mutually act and influence, so as to improve the anti-cracking property of the prepared heat insulation mortar.