The invention discloses a preparation method of solvent-free sofa furniture microfiber synthetic leather, and is characterized in that an environmental-protection type polyether polymeric carbon composite type polyurethane resin is selected as a dry surface layer and a middle layer, a solvent-free layer is a foaming adhesive layer, a microfiber cloth base cloth pasted by a whole dry process and having good hand feeling and high chemical properties is selected for preparing the environmental-protection type sofa furniture leather having the excellent properties of strong real leather effect feeling, three-dimensional and full pattern, abrasion resistance, scratch resistance, hydrolysis resistance and the like; the solvent-free foaming layer is two-liquid type double-compound polyurethane and is composed of an isocyanate A component and a polyether polyol B component. The prepared solvent-free environmental-protection type sofa furniture leather has the advantages of simple leather preparation process, high efficiency and environmental protection, also has the characteristics of strong real leather effect feeling, three-dimensional and full pattern, full and soft hand feeling, wear resistance (wyzenbeek 400 thousand times), scratch resistance, hydrolysis resistance (8 years) and other high physical properties.