摘要：【中文】本发明属于聚氨酯弹性体技术领域，具体涉及一种混凝土改性用双组分聚氨酯组合物及其制备方法。所述的混凝土改性用双组分聚氨酯组合物，由A组分和B组分组成；A组分由以下质量份数的原料聚合而成：5‑20份聚醚多元醇1，80‑100份异氰酸酯；B组分由以下质量份数的原料组成：40‑80份聚醚多元醇2，20‑60份降粘剂，0.5‑5份改性助剂，0.1‑0.5份催化剂；A组分和B组分的混合质量比为1:1‑4。本发明的混凝土改性用双组分聚氨酯组合物，具有粘度低、渗透性强、耐水解、操作时间可控、强度高、易施工操作的优点，对混凝土物料进行改性，提高了混凝土材料的力学与机械性能；本发明该提供其制备方法。 【EN】The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a two-component polyurethane composition for concrete modification and a preparation method thereof. The two-component polyurethane composition for modifying the concrete consists of a component A and a component B; the component A is polymerized by the following raw materials in parts by mass: 5-20 parts of polyether polyol 1, 80-100 parts of isocyanate; the component B comprises the following raw materials in parts by mass: 40-80 parts of polyether polyol 2, 20-60 parts of viscosity reducer, 0.5-5 parts of modification auxiliary agent and 0.1-0.5 part of catalyst; the mixing mass ratio of the component A to the component B is 1: 1-4. The two-component polyurethane composition for modifying concrete has the advantages of low viscosity, strong permeability, hydrolysis resistance, controllable operation time, high strength and easiness in construction and operation, and can be used for modifying concrete materials and improving the mechanical property and mechanical property of the concrete materials; the invention also provides a preparation method thereof.