The invention belongs to the technical field of formaldehyde-free cross-linking non-shrink, anti-wrinkling and easy-care cellulose fabric, and particularly relates to a formaldehyde-free waterborne cross-linking agent and a preparing method thereof and a finishing process for a fabric. Through two new kinds of waterborne cross-linking agents and the selection of water soluble multiple carboxylic ester as a cross-linking catalyst, the cellulose fabric is processed through two steps, thus a cellulose fabric formaldehyde-free easy-care finishing technology reaches a new level, that is, when the mightiness of the fabric is not impaired, high grade formaldehyde-free cross-linking non-shrink, anti-wrinkling and easy-care finishing properties are obtained at the same time, especially after the cellulose fabric is processed, a wet recovery rate of the cellulose fabric is remarkably improved.