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In order to improve the problems of low alkali utilization, poor gas-liquid contact and low ammonia absorption rate in the treatment of kitchen waste digestate by ammonia blow-off technology,，and improve the ammonia recovery efficiency of kitchen waste digestate and the economy of the process, a two-stage digestate ammonia blow-off process was proposed, and the effects of different calcium hydroxide additions and gas flow rates on the effect of ammonia blow-off of kitchen waste digestate were investigated;the effects of different pre-blowing conditions （liquid inlet speed, preblowing time, aeration speed） and ammonia blow-off conditions （soda injection volume, gas-liquid ratio） on the operating effect of the two-stage ammonia blow-off process were also evaluated;and the economic evaluation of the process was carried out. The effects of different pre-blowing （feed rate，pre-blowing time, aeration rate） and ammonia blowing conditions （alkali dosage, gas-liquid ratio） on the operation of the two-stage ammonia blowing process were investigated, and the economic evaluation of the ammonia blowing process of kitchen waste digestate was carried out. The results showed that the ammonia nitrogen removal rate of the digestate was increased significantly （P≤0.05）when calcium hydroxide was added at 4 g/L,，8.2 g/L and 8.7 g/L, with the ammonia nitrogen removal rates of 85.00%,，87.64% and 91.79%, respectively. The total nitrogen removal rate was 81.80%，82.45% and 83.46% （P>0.05） when the gas flow rate was 1L/min,，2 L/min and 3 L/min,， respectively;the optimal conditions for the two-stage ammonia blow-off process for kitchen waste digestate were determined by the ammonia blow-off device experiment as the first pre-blow-off for 8 h （air intake rate 20 L/min）, and the second alkali blow-off for 12h（Ca（OH）2 dosage of 8.7 g/L and air intake rate of 40 L/min）. The final ammonia nitrogen removal rate was 86.61%, and the total phosphorus removal rates was 22.21%. The two-stage ammonia stripping process was evaluated, and the cost of treating each cubic meter of digestate under alkaline ammonia stripping conditions was 7.584 yuan, and the cost of treating each kilogram of NH+4-N was 2.68 yuan. The results can provide a reference for the application of the two-stage ammonia blow-off process for treating kitchen waste digestate.