The invention relates to a preparation method of a low-sodium copper zinc aluminum hydrogenation catalyst. The preparation method comprises the steps of treating a copper zinc aluminum catalyst ternary matrix to obtain catalyst particles, wherein the copper zinc aluminum catalyst ternary matrix is prepared by taking one or more sodium-containing alkalis as a matrix precipitating agent; calcining the particles in a calcining furnace for the first time; washing the particles, which are calcined for the first time, by using deionized water for at least one time until the sodium content of the catalyst is less than or equal to 200 ppm (based on Na2O); after washing and filtering, drying the particles, calcining the particles for the second time and forming to prepare the required catalyst. The catalyst is applicable to the field of hydrogenation.