Provided is a method for producing an aqueous modified polyolefin dispersion composition that is industrially excellent, the method comprising the steps of preparing an aqueous modified polyolefin dispersion that does not contain a surfactant, and then mixing a specific surfactant, whereby foaming can be suppressed during the removal of the organic solvent, and the processing time can be significantly reduced. The method for producing an aqueous modified polyolefin dispersion composition comprises the steps (1) and (2): (1) step 1 of obtaining an aqueous modified polyolefin dispersion using a modified polyolefin, an organic solvent, a base compound, and water as starting materials; and (2) step 2 of mixing a surfactant with the aqueous modified polyolefin dispersion in an amount of 0.1 to 10 wt. % based on the weight of the modified polyolefin.