The invention discloses an alkali slag steel bar anchorage material which comprises powder and a water agent. The powder and water agent are uniformly mixed when in use. The powder comprises ore powder, clinker and fine sand. The water agent is prepared by mixing a potassium fluoride solution and a sodium silicate solution. The mass ratio of the water agent to the powder is 0.30-0.45. The mass ratio of the clinker to the ore powder in the powder is 1:9-4:6. The mass ratio of the total weight of the clinker and ore powder to the fine sand is 0.8-1.2. The mass ratio of the potassium fluoride solution to the sodium silicate solution in the water agent is 1:4-1:3. The steel bar anchorage material has the advantages of high strength, favorable durability, high bondability with steel bars, low price and no toxicity, is convenient for construction, and can be widely used in steel bar anchorage of building construction engineering, water conservancy and hydroelectric engineering, road and bridge engineering, and the like.