Flame retardant wood composite material and preparation method thereof

The invention discloses a flame retardant wood composite material and a preparation method thereof. The preparation method comprises the following steps: (1) a wood is extracted by using benzene alcohol, and is dried in vacuum for future use; (2) solution containing ammonium phosphate and ammonium borate is prepared in a volume ratio of 4: 1; the PH value of the solution is adjusted by ammonia water within 6-7; and the solution serves as precursor liquid; (3) in a vacuum pressure reducing system, the wood for future use in the step (1) is dipped in the precursor liquid prepared in the step (2), and the precursor liquid is injected in a wood substrate; and (4) the surface of the dipped wood in the step (3) is washed by water, and is dried in vacuum by 24 hours under the conditions of temperature of 65 DEG C and vacuum degree of 0.1 MPa to obtain the flame retardant wood composite material. The wood, treated by the method, improves the flame retardance and the mechanical performance, and widens the application