The invention discloses a dyeing and finishing method of superfine denier nylon fabric, belongs to the field of processing on the superfine denier nylon fabric, and aims at solving the problems that dyeing defect and uneven dyeing of the superfine denier nylon fabric are easily generated in the dyeing process. The method disclosed by the invention comprises the steps of: cold heaping, open-width desizing, pre-setting, dyeing, performing fixation, baking and molding a finished product. An anionic leveling agent disclosed by the invention has affinity on nylon, and can generate an unexpectedly dyeing effect on the fiber together with anionic dye. Thus, the initial dyeing speed of the dye is reduced, so as to achieve a uniform dyeing effect; and the fold resistance of the fabric is improved when the craping style of the fabric is kept by presetting the desized fabric. By using the dyeing and finishing method, the dyeing process is even, the color and the luster are good, the colour fastness is good, and the like; and the dyeing defect can not be generated, and the fabric processed by using the method accords with the requirements of superior products specified by the standard of GB / T17253-2008 'synthetic filament yarn fabric'.