Abstract: The effects of different nitrogen levels on the yield and economic benefits of cauliflower were studied by taking cauliflowers as the test material,. Five treatments were set in the experiment, with the same phosphate and potash fertilizer in each treatment and different nitrogen application, being respectively 0 (N₀PK), 186.0 (N₁PK), 265.5 (N₂PK), 345.0 (N₃PK) and 399.0 (N₄PK) kg·hm^-2. The results showed that the yield increased by 76.0%-109.1% and the income increased by 82.5%-120.3% under different nitrogen applications compared with that under no nitrogen application in the situation of a certain amount of phosphate and potash fertilizer in the cultivated lime sand soil in Licheng District of Quanzhou City. Among them, the treatment of N₂PK (nitrogen application of 265.5 kg·hm^-2) had the highest yield and economic benefit, which increased by 109.1% and added 80 431.49 yuan·hm^-2 compared with the control treatment without nitrogen application. Through regression analysis, the maximum economic yield of cauliflowers could reach 38 119.8 kg·hm^-2, and the nitrogen application amount was 263.4 kg·hm^-2 when the maximum economic yield was reached. Insufficient and excessive nitrogen fertilizers would affect the yield and economic benefit of cauliflowers.