The invention provides a beverage fermentation liquor production system, and relates to the technical field of sterilization machines. A sterilization machine comprises a box body, a sleeve is rotationally connected in the box body, a screw rod is slidably connected in the sleeve, a cross rod is fixedly connected to the outer side of the sleeve, a wiping strip is fixedly connected to one end of the cross rod, a threaded rod is arranged on the top of the box body, and a lifting assembly is arranged on the outer side of the threaded rod. A fermentation tank comprises a supporting frame, the top of the supporting frame is sleeved with the fermentation tank, a rotating rod is arranged in the fermentation tank, penetrates through the top of the fermentation tank and is rotationally connected with the fermentation tank, a plurality of rotating blades are fixedly connected to the outer side of the rotating rod, the outer side of the rotating rod is sleeved with a connecting plate and is fixedly connected with the connecting plate, the outer side of a reciprocating screw rod of an overturning assembly is sleeved with a moving block and connected with the moving block through a ball nut pair, a rotating rod is arranged on the outer side of the moving block, the rotating rod penetrates through the moving block and is rotationally connected with the moving block. The sterilization equipment of the production system is easy to clean, and the fermentation efficiency of the fermentation tank is also high.