In this study, the solid celery planted in greenhouse was used as the research object with six treatments: clear-water (CK), self-made sorbitol-chelated potassium fertilizer with the chelating rate of 60% (CR60), 70% (CR70), 80% (CR80), 90% (CR90) and 100% (CR100). The effects of foliar spraying with different chelation rates of sorbitol-chelated potassium on the yield, quality, potassium uptake and utilization of celery during harvest period were investigated. The results showed that: 1)Compared with CK, foliar spraying of sorbitol-chelated potassium accelerated celery growth and yield, CR90 showed the best effect of yield increase, which significantly increased the yield by 27.9% compared with CK. 2)Compared with CR60, CR70 and CR80, nitrate contents in petioles of CR90 and CR100 decreased by 13.8%-28.4% and 21.2%-34.6% respectively, while nitrate content in leaves reduced by 2.34%-18.9% and 13.2%-27.9%, respectively. Compared with CK, CR60 and CR70, soluble sugar content in leaves of CR90 was dramatically increased by 57.4%-82.9%. Soluble protein content of petiole of CR90 was remarkably enhanced by 16.3%-28.9% compared with CK, CR60, CR70 and CR100. Soluble protein content of leaves of CR70 was greatly increased by 29.0% compared with CR60. Compared with CK, CR60, CR70, CR80 and CR90, soluble solids of petiole and leaf of CR100 were substantially promoted by 4.26%-11.4% and 17.0%-35.2%, respectively. 3)Compared with CK, CR treatments increased potassium content and accumulation in celery at harvest stage, and CR90 had the most obvious result, whose potassium content in celery leaves, petioles and roots increased by 38.6%, 11.8% and 17.4%, respectively, and the potassium accumulation increased by 33.60%, 61.8% and 35.1%, respectively. Based on plant potassium application, soil and leaf potassium uptake, the apparent balance of soil potassium was calculated. It was found that foliar application of different rates promoted the absorption of soil potassium by plants. The surplus of different chelation rates was K₂O 12.11-85.60 kg/hm², and the surplus of CR90 was the least, which was 12.11 kg/hm². In conclusion, the application of high chelation rate sorbitol-chelated potassium fertilizer could increase celery yield, improve its nutritional quality, reduce nitrate content, and ensure the contribution rate of foliar potassium fertilizer, of which the optimal chelation rate of sorbitol chelated potassium fertilizer was 90% for celery.