The invention discloses a high-strength high-temperature-resistance anti-deforming precoated sand and a processing technology thereof, and belongs to the technical field of new materials. The high-strength high-temperature-resistance anti-deforming precoated sand is prepared from the following components of, by weight, 100 parts of roughing sand, 2 to 4 parts of ferroferric oxide, 1.5 to 5.6 partsof antiadhesion sand, 1.8 to 3 parts of anti-veining additive, 1.5 to 5 parts of phenolic resin, 0.5 to 1.5 parts of No.1 enhancer, 0.3 to 1.0 part of No.2 plasticizer, 0.1 to 0.5 part of urotropinesolution, and 1.2 to 2.5 parts of lubricating agent. According to the precoated sand provided by the invention, by improving and optimizing the matching ratio of raw ingredients and a preparation process, the precoated sand has the advantages of high temperature resistance, high deformation resistance, good formability, high strength, good fluidity and low gas content at the same time, fully meetsthe production technology requirements of engines of complicated structures and with high performance, and particularly meets the production technology requirements of small sand cores with complicated shapes and thick walls, so that not only are the high-temperature strength and the collapsibility of the sand core after casting during a nonferrous metal casting process ensured, but also the mechanical property of a casting piece can be further improved.