A sheets-separating module and a multifunction printer using the same are provided. The sheets-separating module includes a body, an elastic element and a plurality of sheets-separating structures, in which the body has an opening, the elastic element is disposed in the opening of the body and has a first end and a second end. The first end of the elastic element connects the body, the second end thereof is a free end, and a section modulus of the elastic element is gradually descending from the second end to the first end. The sheets-separating structures are disposed on the elastic element.