The double-bonded cross-linked waterborne polyurethane was synthesized by using isophorone diisocyanate (IPDI), polyadipate-1,4-butylene glycol diol (PBA) as the main raw material and melamine as the crosslinking agent. The acrylate modified waterborne polyurethane adhesive was prepared by in-situ polymerization. The structure and properties of the polyurethanes were characterized by FTIR, XRD, DLS, DTA, electronic tensile machine and Shore hardness tester. The polyurethane performance was optimized by adjusting the mass ratio of aqueous polyurethane to acrylate and the amount of melamine added. The results showed when the mass ratio of waterborne polyurethane to acrylate was 6:4 and the mass of melamine to waterborne polyurethane was 0.53%, the degradation temperature of adhesive with 5% could reach 312 °C, water absorption rate was only 4.7%, The T-peel strength was 5.3 kN/m.