The invention relates to a method for preparing a copper catalyst for producing acrylamide. A molar ratio of raw materials is that: the molar ratio of sodium hypophosphite to copper sulphate is 1.5 to 1; the molar ratio of sulphuric acid to copper sulphate is 0.35 to 1; and the molar ratio of sodium hydroxide to copper sulphate is 5:1. The method comprises the following steps of: discharging a generated liquid after reacting into a middle storage tank, cleaning a reactor with 0.5m<3> of deionized water, and discharging a cleaning fluid into the middle storage tank; pumping the cleaning fluid into a leaf filter with a centrifugal pump for feeding and washing; when a filtrate flows past a discharge pipe of the leaf filter without catalyst leakage, filtering the reaction liquid, washing a filter cake with 45m<3> of deionized water, and controlling the flow rate to be 15 to 20 m<3>/h; and after washing, washing the filter cake into the catalyst storage tank with 2.4m<3> of the deionized water. The method has the characteristics of high preparation efficiency of the catalyst, low cost and less pollution; the preparation period of the copper catalyst is reduced from 16 hours of a settlement vacuum filtration technique to about 5 hours; and compared with that of the settlement filtration technique, the using amount of the deionized water and the generation amount of the copper-containing waste water are reduced by about half.