The invention provides a blast furnace top material distribution precision control method and belongs to the technical field of automatic control. An encoder is installed on a motor of a material distribution chute and used for detecting the angle alpha between the material distribution chute and the center line of a blast furnace. Whether an automatic material flow closing regulating valve control program is implemented or not is judged by comparing the difference value between the alpha-angle ring body set angle and the next ring set angle; and the set speeds of different gears of the alpha-angle motor are given by comparing the difference value between the alpha-angle set angle and the actual angle. The blast furnace top material distribution precision control method has the advantages that materials can be more precisely distributed to the preset positions when a blast furnace material tank conducts material distribution in the blast furnace through the material distribution chute; the situation that excessive materials are distributed on a chute movement line in the starting process of the chute due to the fact that the difference value between the alpha-angle ring body set angle and the next ring set angle is too large is avoided; and the situation that the material emptying speed is decreased due to the fact that the material distribution chute moves slowly is also avoided.