The invention discloses a fermented crude pear juice production system. The system comprises a control part, a pear juice squeezing part, a circulating concentration part and a draw solution circulating part, wherein the pear juice squeezing part comprises a disinfection tank, a soaking pool, a transmission groove and a squeezing filter, and is used for cleaning and squeezing pears; the circulating concentration part comprises a circulating tank and a separation tank; the squeezed pear juice is circulated in the circulating tank and the separation tank until the sugar degree and flavor substance content in the pear juice achieve required values; the draw solution circulating part comprises an evaporator and a plurality of parallel drawing tanks, and is used for providing and regenerating draw solution; and the control part comprises a PLC controller, an input end, a signal reception end and a signal output end, and is used for automatically controlling the system. The production systemutilizes a positive permeable membrane technology, so that the moisture content in the pear juice can be reduced without changing the physicochemical properties of ingredients in the pear juice and the aims of concentrating the pear juice and strengthening the flavor are achieved.