The invention relates to a high-
flame-retardant and high-rate plugging foam material and a preparation method thereof, belonging to the field of novel materials. The high-
flame-retardant and high-rateplugging foam material is mainly used at the operation positions, which need to be filled and sealed, of buildings, bridges, mining, dams, and the like. The plugging material obtained by the method prolongs the 
rise time while guaranteeing a higher 
expansion rate, and solves the problems that the material in the prior art is early in rising in a plugging process and rapid in 
reaction speed, so that the operable time is short, the sealing effect is poor, and more hidden problems are caused. The foam material obtained by adopting reasonable raw materials and a reasonable proportion has the characteristics of being slow in initial reaction, strong in 
operability, good in dimensional stability, high in 
expansion rate and good in filling and sealing properties, and not shrinking; the materialis prepared by compounding a variety of 
flame retardants, so that the flame retardant performance is greatly improved, and the safety of construction is guaranteed.