In order to guide the scientific fertilization of facility celery and verify its effect on increasing yield and income, a plot experiment is conducted on foliar spraying of water-soluble fertilizer containing humic acid on facility celery. The experiments use conventional fertilization as the control (CK) treatment, and set up two foliar spraying treatments: spraying water (T1) and spraying water-soluble fertilizer containing humic acid (T2). The growth indicators, quality indicators, and yield of celery are measured respectively. The results show that the plant height, number of leaves per plant, number of tillers per plant, and weight per plant of T2 treatment are superior to those of CK and T1 treatments. Compared with CK and T1 treatments, the nitrate content in celery treated with T2 decreased by 14.50% and 6.85%, while the vitamin C content increased by 21.88% and 18.18%, respectively. The celery yield of T2 treatment is significantly higher than that of CK and T1 treatments, and better economic benefits can be obtained.