The invention provides a flame-retardant and high-temperature resistant oriented particle board, which comprises a surface layer and a core layer, the surface layer is composed of large shavings; the core layer is composed of large shavings and fine shavings, and the paving angle between the surface layer and the core layer is 45-90°. The present invention also provides a method for preparing flame-retardant and high-temperature-resistant oriented strand board, including shavings, initial washing of shavings, drying, re-washing of shavings, draining, balancing, curing, drying, mixing, sizing, paving, hot pressing, Trimming, sanding. The beneficial effects of the present invention are: the flame-retardant and high-temperature-resistant oriented particle board of the present invention has good thermal stability, is not easy to delaminate and crack when heated, and can ensure stable flame-retardant performance; it is difficult to release toxic substances when heated; the added flame-retardant components can effectively adhere to On the surface of shavings, it has good flame retardant performance and can withstand high temperature attack; it has good physical and mechanical properties and good durability.