▎ 摘　　要

NOVELTY - A composite hydrophobic agent comprises an oil phase core and aqueous phase shell coated on the surface of the oil phase core. The oil phase core comprises amphiphilic material and hydrophobization reagent. The aqueous phase shell comprises hydrophilic nanomaterial. USE - The composite hydrophobic agent is used as additive in preparing concrete (claimed). ADVANTAGE - The composite hydrophobic agent can improve the dispersion of the composite hydrophobic agent so as to optimize the composite hydrophobic agent and the concrete interface structure, delay the release of the composite hydrophobic agent to reduce the influence of the early hydration of the cement, and realize the optimization and lifting of the mechanical property of the hydrophobic concrete. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the composite hydrophobic agent.