［Objective］ Mainly relying on petrochemical resources，traditional epoxy resins present issues such as unsustainability，high carbon emissions，and the biotoxicity of the main raw material bisphenol A. Moreover，their characteristics of being difficult to degrade and recycle can leadto resource waste and exacerbate the ecological burden. Under the current situation，the development oftraditional epoxy resins faces numerous challenges. In order to address these challenges and meet therequirements of environmental protection and sustainable development，there is an urgent need to find sustainable alternatives to petroleum-based resins.［Methods］Itaconic-acid-derived epoxy resins（EIA） and water-soluble citric acid（CA，as curing agents） were used to develop a bio-based， recyclable，and removable epoxy resins. By carrying out the curing process by varying the molar ratio of EIA to CA，bio-based epoxy resin coating was obtained.［Results］The epoxy resins coating exhibited excellent solvent resistance and outstanding mechanical properties，with a tensile strength of 63 MPa and a glass-transition temperature（T_g） of 55 ℃ . The pencil hardness and adhesion of the coating reached 6H and 4B respectively. By adjusting the alkaline solution，the acidic curing agent could be efficiently recycled and reused to cure EIA. More importantly，this epoxy resins coating was removable.［Conclusion］The research results indicate that this bio-based epoxy resin holds the potential forapplications as a high-performance and sustainable material in the coatings field.