The invention discloses a 
modified atmosphere packaging and fresh keeping method of green-peel walnuts. Through the steps of performing precooling treatment, compounding gas, performing filling and packaging, performing pumping, performing inflating and performing sealing, the purpose of fresh keeping can be achieved, wherein materials of 
modified atmosphere packaging bags are any kind of PP materials and PET materials; in 
modified atmosphere packaging 
mixed gas, the 
gas concentration of O2 is 14%-16%, and the 
gas concentration of CO2 is 2%-3%; the fresh keeping method provided by the invention can reduce the 
linear rate of the soft rot rate after fresh walnuts are picked for about 43.44%-79.47%, and after the walnuts are stored for 50 days, the soft rot rate is only about 24.14%; the clean and sweet mouth feel of green-peel walnut kernels is maintained; time for enabling 
moisture content of peel to increase to the 
critical level of 
disease occurrence is delayed to about two times thanthat of before; time for generating 
peak value of endogenous 
ethylene of the peel of the green-peel walnuts is delayed, and the commodity rate of the green-peel walnuts is maintained; the modified 
atmosphere packaging and fresh keeping method is obviously better than the prior art; fresh quality of the fruits can be better maintained; the situation that in the storage period of the fruits, the 
plant disease occurs is reduced; the 
senescence of the fruits is delayed, and the storage period is effectively prolonged; and the modified 
atmosphere packaging and fresh keeping method is especially suitable for Xinxin number 2 green-peel walnuts, and the obtained fresh keeping effect is notable and outstanding.