The aqueous two-component polyurethane coating prepared by YL-W6700 can be diluted with water in advance or a small amount of highly hydrophilic co-soluble 2/2 agent is added to control viscosity and improve the permeability of the film. The product has high hardness, good physical properties and excellent chemical resistance. YL-W6700 can also be used as a crosslinking agent for water-based polyols and for most neutral water-based polymer dispersions such as polyurethanes, polyvinyl acetate resins, polyacrylates and synthetic rubber dispersions. After the addition of YL-W6700, the two-component coating to be used must be used during the activation period, which is affected by the polymer content and other components (such as resins, thickeners, plasticizers, etc.); In many dispersions, the end point of the activation period (usually a few hours) does not show up as gelation.