The formula of cement-based inorganic rebar adhesive consists of portland cement, micro-expansive special cement, pozzolanic material, superplasticizer, retarder, defoamer, waterproof agent, antifreeze, rust inhibitor and quartz sand. It has the characteristics of ultra-high strength, high temperature resistance, direct welding, suitability for water environment operation, fatigue resistance and strong durability, and can be widely used for planting steel bars and bolts during building maintenance and reinforcement. The application scope is wider, and many bottleneck problems in the anchoring industry are solved, so that the construction operation is no longer limited by factors such as environment, which greatly speeds up the construction efficiency and speed and reduces the engineering cost.