The present invention discloses interface sand pulp, the constitutional materials of which comprises inorganic cementing compound, organic cementing compound tylose ether MC and hydrophobe redispersionable rubber powder, skeletal material and solidification setting accelerator; the ingredients with the following weight percent: 40 to 50 percent of inorganic cementing compound, 0.05 to 1.0 percentof tylose ether MC, 1.0 to 2.5 percent of hydrophobe redispersionable rubber powder, 48 to 60 percent of skeletal material, and 0 to 6 percent of solidification setting accelerator. The interface sand pulp of the present invention has strong adhesive strength, good water-resistant performance, small modulus and good climate-resistant performance, and is free from aging and is free from shrinking during the hardening, and has good flexibility, and is free from producing the interface stress. The interface sand pulp is particularly suitable to be used as the processing agent for the surface of the aeroconcrete and the smooth concrete, and is also applicable to be used as the transitional layer between the substrate and the coating layer, and can also be used for bonding the ceramic tile.