The invention discloses a method for improving the feeding precision of leaves in production of tobacco primary processing. The method includes the following steps that a feeding flow set value is calculated, a prediction control model of a leaf feeding system is established, and the prediction output quantity and feedback output quantity of feeding pump frequency are calculated. With the method, the problems that when material flow fluctuates greatly, feeding transient precision exceeds standards, and feeding accumulated precision is high during batched production are solved, a good control effect can be achieved, the inner quality of products is improved, and the satisfaction degree of the follow-up procedure of the products is increased. Compared with a traditional PID algorithm, the feeding transient precision and accumulated precision are remarkably improved. On-site production data shows that when the material flow fluctuates greatly, the average value of the feeding transient precision of the leaves is decreased to 2.37% from 4.13%, and the average value of the accumulated precision is decreased to 0.04% from 0.29%.