The invention provides scrape-removable water-based ink for flexographic printing, which comprises raw materials of color paste, base ink and an admixture, wherein the base ink comprises water-based silver ink, shading black, peeling oil and protective water-based oil. The invention further provides a preparation method of the scrape-removable water-based ink for flexographic printing. The preparation method comprises the steps as follows: step 1, the water-based silver ink is prepared for reserve; step 2, the shading block is prepared for reserve; step 3, the peeling oil is prepared for reserve; step 4, the protective water-based oil is prepared for reserve; step 5, the base ink is prepared for reserve; step 6, the color paste is prepared in an agitator for reserve; step 7, the color paste prepared in the step 6 is added to water and dispersed and ground in a dispersion machine for reserve; and step 8, the color paste, the base ink and the admixture are taken by weight percentage andevenly agitated and mixed, and then the product is prepared. The invention provides the one-step water-based ink and the manufacturing method thereof, which have the advantages that the production process flow of special water-based ink is changed, the manufacturing time is shortened, production procedures are reduced and complete grinding is not needed.