The invention relates to a preparation method of a high-
flame-retardant artificial plate. The preparation method comprises the following steps: 
sawdust and 
wood shavings are selected, impurities like 
silt, dust and 
scrap iron are removed through sieving and magnetic attraction, pulverizing is carried out, then an obtained material is steamed at 110-120 DEG C for 15-30min, and then is dried till a water ratio is lower than 5.0%, an obtained dried 
raw material and high-
flame-retardant 
adhesive powder are mixed uniformly in a material mixing 
machine, and after blank loading, primary 
hot pressing and cooling are carried out, a sandwich layer is obtained; and an upper 
surface layer and a lower 
surface layer which are made of 1.0-1.2mm thick veneers are prepared, the surfaces, fitted with the sandwich layer, of the upper 
surface layer and the lower surface layer are coated with appropriate amounts of molten high-
flame-retardant 
adhesive powder, then the upper surface layer and the lower surface layer are combined with the sandwich layer together, and after secondary 
hot pressing, cooling, edge 
cutting and 
polishing processes are carried out, the high-flame-retardant artificial plate is produced. The temperature of the primary 
hot pressing is 110-120 DEG C, the time is 20-50s, the pressure is 6-8MPa; and the temperature of the secondary hot pressing is 120-130 DEG C, the time is 10-15s, and the pressure is 4-6MPa. The high-flame-retardant artificial plate has the excellent flame retardant property, and can be 
cut freely as required in a using process, and the color of the 
cut edge does not affect the using effect.