The utility model discloses an agricultural organic waste fermentation CO2 fertilizer injection unit, it relates to fermentation technology device field, and it contains, and pin, bottom connecting rod, main tributary vaulting pole, gear lever, arc are shored, the diagonal brace, and the bottom connecting rod is installed to pin one side, and the main tributary vaulting pole is installed to the pin top, and gear lever is installed to main tributary vaulting pole one side, and main tributary vaulting pole one end is installed the arc and is shored, and the arc is shored both sides and is installed the diagonal brace. The reactor has draws materials simply, and the installation is dismantled conveniently, and the transportation is convenient, the cost is low, can extensively be applicable tothe vegetable greenhouse CO2 fermentation, satisfies crops CO2 demand in the big -arch shelter, guarantees the normal growth of crop.