［Objective］To address issues such as slow drying speed and short pot life during theapplication of waterborne epoxy primers.［Methods］Acrylic acid was used to perform ring-opening modification on epoxy resin，synthesizing a chain extender AAE51 containing carbon-carbon double bonds（C=C）capable of undergoing Michael addition reactions. Utilizing the characteristic that thedouble bond of this intermediate preferentially reacts with sterically hindered secondary amines（—NH—） during the Michael addition reaction，a waterborne epoxy curing agent with a highly crosslinked network structure was constructed. The chemical structure of the chain extender was characterized usingFourier-transform infrared spectroscopy（FT-IR）. The effects of the AAE51 addition amount on the stability of the curing agent，as well as the drying performance and corrosion resistance of the resulting coating films，were systematically investigated.［Results］When the addition amount of AAE51 in the waterborne epoxy curing agent was 8%（based on the total mass of the curing agent）， the curing agent had moderate viscosity and good water solubility. The self-drying performance of the coating filmformulated with it at room temperature was significantly improved，reaching a hardness of HB in12 hours and H in 24 hours. It could withstand 336 hours of salt-spray testing without blistering on thepanel surface，and the peeling width in the scratched area was less than 3 mm. It also showed noblistering after 336 hours of initial water resistance testing，and the system viscosity maintained good stability within a 3-hour pot life.［Conclusion］In this study，through the Michael addition reaction， the NH groups that are difficult to react with epoxy are fully utilized to form a network structure，therebyincreasing the glass-transition temperature of the curing agent and achieving the goal of acceleratingthe drying speed of the film.