本申请涉及混凝土的领域，具体公开了一种可抗硫酸盐侵蚀的混凝土及其制备方法。一种可抗硫酸盐侵蚀的混凝土其原料包括水泥、粉煤灰、矿渣粉、砂子、碎石、水、外加剂、改性碳纳米管和堵管纤维；所述改性碳纳米管由在碳纳米管内壁上依次涂覆氧化金属层和可溶性的硫酸盐吸附层得到；所述堵管纤维用于对改性碳纳米管的端口进行封堵。其制备方法为：步骤一：将水泥、粉煤灰、矿渣粉、砂子、碎石和改性碳纳米管混合后得到干拌预混物；步骤一：将水、外加剂、堵管纤维和干拌预混物混合，搅拌后得到可抗硫酸盐侵蚀的混凝土。本申请的混凝土可用于深海隧道浇筑工程或盐渍土地的施工工程，其具有优秀的抗硫酸盐侵蚀性能。

The invention relates to the field of concrete, and particularly discloses sulfate corrosion resistant concrete and a preparation method thereof. Raw materials of the concrete comprise cement, fly ash, slag powder, sand, gravel, water, an additive, modified carbon nanotubes and tube plugging fibers. The modified carbon nano tube is obtained by sequentially coating an oxidized metal layer and a soluble sulfate adsorption layer on the inner wall of the carbon nano tube; and the tube plugging fiber is used for plugging the port of the modified carbon nanotube. The preparation method comprises the following steps: 1, mixing the cement, the fly ash, the slag powder, the sand, the gravel and the modified carbon nanotubes to obtain a dry-mixed premix; the preparation method comprises the following steps: 1, mixing water, an additive, pipe plugging fibers and a dry-mixed premix, and stirring to obtain the sulfate-erosion-resistant concrete. The concrete can be used for deep sea tunnel pouring engineering or salinized land construction engineering, and has excellent sulfate corrosion resistance.