The invention discloses high temperature resistance precoated sand, which comprises base sand, a binder, hexamethylenetetramine, a phenol formaldehyde resin, a silane coupling agent and an additive A, wherein the base sand comprises, by weight, 55-60 parts of iron ore sand, 60-70 parts of forsterite sand, and 7-10 parts of diatomite, a particle size of the base sand is 100-150 mesh, 3-5 parts by weight of boric acid, 1-2 parts by weight of water-soluble polymer glue powder, 3-5 parts by weight of starch, 0.5-0.8 part by weight of rosin, 4-5 parts by weight of dextrin and 4-6 parts by weight of water are subjected to a reaction and drying to obtain the binder, 4-6 parts by weight of a straw powder material, 2-4 parts by weight of sepiolite and 5-8 parts by weight of water are subjected to a mixing calcination treatment to obtain the additive A, a particle size of the straw powder material is 0.5-0.8 mm, and the obtained calcined product, 2-4 parts by weight of montmorillonite powder and 3-4 parts by weight of water glass are subjected to mixing granulation. The high temperature resistance precoated sand has the following characteristics that: moisture absorption resistance is good, roughness is low, high temperature resistance is provided, and sand sticking on a cast is not easily generated.