YD55-1 resin is a room temperature self-crosslinking styrene-acrylic emulsion with core-shell structure developed for water-based wood paint. It is suitable as a resin for water-based primer. It has good film-forming properties, sanding properties, and good adhesion to the substrate; it does not contain harmful substances such as APEOs, harmful metal elements, and is safe and environmentally friendly; it has good compatibility with various additives, pigments and fillers, and is easy to prepare.