The invention discloses crack-resistant 
thermal insulation mortar. The crack-resistant 
thermal insulation mortar is characterized by being prepared from the following materials in parts by weight: 310-380 parts of 
cement, 130-160 parts of 
bentonite, 180-240 parts of phosphorous 
slag powder, 4-7 parts of 
acrylate resin, 8-12 parts of 
methyl cellulose, 120-165 parts of glass beads, 5-8 parts of 
calcium oxide, 10-12 parts of 
magnesium oxide, 18-25 parts of creeper roots, 30-40 parts of Japanese banana leaves, 3-5 parts of 
sodium fluosilicate and 4-7 parts of auxiliaries. The 
thermal insulation mortar prepared in the invention has the characteristics of being light in volume-weight, low in heat 
conductivity coefficient, crack-resistant, strong in adhesion stress, excellent in peaceability and construction performance, has the advantages of being waterproof and impervious, and high in 
compressive strength, and can be widely applied to thermal insulation of interior and exterior walls of a building and other special projects. The crack-resistant thermal insulation mortar disclosed by the invention comprehensively utilizes various waste 
slag, so that environment is protected, resources are saved, recycling economy effect of changing waste into things of value is realized, product competitiveness is improved, and therefore, the crack-resistant thermal insulation mortar can be popularized and applied.