Abstract: To obtain the preparation conditions and explore the physico-chemical properties of early-rice seed-coating fertilizer, the single factor tests of the amount of fertilizer, the load rate of seed, the amount of coating agent, coating method and drying time were conducted, and the optimal preparation conditions of early-rice seed-coating fertilizer were determined by orthogonal test L₉(3⁴). The physico-chemical properties of the pH, viscosity, film-forming time, film-forming properties, split time in water of coating, coating uniformity, coating-off rate were measured. The results showed that the optimal preparation conditions were as follows: the amount of fertilizer was 100 g/kg, the load rate of seed was 500 g/kg, the amount of coating agent 1 g/kg, coating method was A-B, drying time was 40 min. Test results of physico-chemical properties showed that the pH was 6.90, viscosity was 9.23 mPa/s, the film was middle level, the film-forming time was 7.5 min, split time in water of coating was 6.5 min, coating uniformity was 95.0%, coating-off rate was 9.2%, which indicated that the coating-agent for early-rice seed-coating fertilizer had good physico-chemical properties.