The invention relates to a low-temperature multi-effect sea water desalinization product water intermediate heat regenerative system which comprises a condenser and a plurality of serial connected evaporators, wherein material water discharged by the condenser enters into the evaporators after boosted by a primary water pump, wherein the evaporators are at least divided into a high temperature efficient group and a low temperature efficient group, the material water enters into the evaporator high temperature efficient group after raising the temperature and is supplied for the evaporator high temperature efficient group, salt water discharged by the evaporator high temperature efficient group is supplied for the low temperature efficient group after reducing the temperature and boosting; finished water discharged by an intermediate efficient group exchanges heat with the material water, the finished water subjected to heat exchange is discharged to the finished water side of the evaporators corresponding to temperature efficiency, and the heated material water is conveyed to the intermediate temperature efficient group with higher temperature efficiency. The water yield of the high temperature efficient group can be increased by adopting the system, the system efficiency is improved within a certain range, the steam consumption of heating can be reduced and the system water ratio is improved without unchanging the water yield of the system.