The invention discloses a preparation method of an amorphous catalyst for catalytic hydrodeoxygenation of phenol, aldehyde, alcohol and ketone oxygenated compounds in biological oil. The catalyst mainly consists of Ni, W and B as active ingredients. The preparation method comprises a step of preparing the catalyst through induced chemical deposition by taking soluble nickel salt and tungstate as raw materials, NaBH4 or KBH4 as a reducing agent and ammonia water or ethidene diamine as a chelating agent. The preparation method has the characteristics of improving utilization rate of the NaBH4 or KBH4 as a reducing agent, reducing coverage of boron oxide in active centers on the surface of the catalyst, and increasing the number of the active centers on the surface of the catalyst; the entire preparation method is simple in process, moderate in preparation condition and free from protective gas; the prepared catalyst is quite high in catalysis activity, and can implement catalytic hydrodeoxygenation of the oxygenated compounds at relatively low reaction temperature and obviously reduce contents of benzene of aromatic hydrocarbon in a reaction product.