The invention belongs to the technical field of polymers, and particularly relates to waterborne polyurethane, waterborne ultraviolet-cured polyurethane and preparation methods of waterborne polyurethane and waterborne ultraviolet-cured polyurethane.Waterborne polyurethane is one kind of novel non-isocyanatepolyurethane, contains no isocyanate groups with high toxicity and high moisture sensitivity, has no pollution to the environment, is not harmful to human body health, does not burn easily and is good in safety. Sulfonate groups are adopted as waterborne groups, andwaterborne polyurethane can keep stable under certain acidic condition, does not need tertiary amines, is free of pungent smell and has higher adhesive property, water resistance and heat resistance when compared with carboxylic acid type waterborne polyurethane; meanwhile, cyclic carbonate compounds have the advantages of high boiling point, small odor, low evaporation rate, low toxicity and the like and have excellent biological degradability, carbon dioxide can be taken as a raw material of cyclic carbonates, and green and environment-friendly requirements are met.