Preparation method of wood fiber with hydrophobic function and product of preparation method

The invention provides a preparation method of a wood fiber with a hydrophobic function. The preparation method comprises the steps of drying and sieving a wood fiber raw material to form lignocellulose powder, performing acidolysis on the lignocellulose powder with concentrated sulfuric acid at 80-120 DEG C for 60-120min, performing alkalization and degreasing on a material with alkaline liquor and rosin at 120-160 DEG C for 180-240min, cooling the material to a room temperature, filtering off pregnant liquor, regulating a pH (potential of hydrogen) value of the material to be 6-8 with diluted acid, stirring and washing the material at 50-70 DEG C, washing the material with hot water added with siloxane, and finally putting the material in a drier at 110 DEG C for drying to form the product. The preparation method is simple and safe in operating condition, short in reaction time, and washing is easy, the obtained product is good in dispersity, good in cracking resistance effect and high in strength, and a hy