The invention provides a preparation method of a fatty alcohol tertiary amine load type catalyst. The preparation method of the fatty alcohol tertiary amine load type catalyst comprises the followingspecific steps: premixing the following metal oxides and a carrier in parts by mass: 20-40 parts of copper oxide, 5-10 parts of nickel oxide, 0-10 parts of zinc oxide, 0-5 parts of magnesium oxide and35-75 parts of the carrier in a ball-miller, successively adding deionized water and a dispersing agent and dispersing and grinding for 1-4 hours, after filtering and drying, roasting for 2-4 hours at the temperature of 300-400 DEG C, and after grinding and hydrogen reduction, catalyzing fatty alcohol under the condition of normal pressure to react with dimethylamine so as to prepare tertiary aliphatic amine. A preparation process of the catalyst is simple, and is easy to operate, the preparation method is energy-saving and environmentally friendly, and the performance of the catalyst is good.