The invention discloses emulsion absorption black gel ink and a preparation method of the gel ink. The gel ink is composed of carbon black paste, polymer emulsion, absorption accelerator, functional assistant, thickening agent, defoaming agent and deionized water; the raw materials are proportioned according to the total weight percents as follows: 10.0-40.0 percent of the carbon black paste, 2.0-20.0 percent of the polymer emulsion, 0.1-0.5 percent of the absorption accelerator, 10.0-30.0 percent of the functional assistant, 0.5-10.0 percent of the thickening agent, 0.1-0.2 percent of the defoaming agent and the rest percent of the deionized water. The emulsion absorption black gel ink prepared in the invention has the advantages of higher color depth in writing, good hand feel and good glossiness, keeping unchanged writing performance after being stored for 12 months under normal temperature, applying to industrial production, and having significant commercial value.