NOVELTY - Nuclear power and low temperature multi-effect sea water desalination coupled co-production system comprises small nuclear reactor (1) connected with a steam generator (3) and a circulating pump (2), which are connected to form a main loop, steam turbine (4) connected with tube side inlet of steam converter (5) having an outlet connected with condensed water subsequent processing device, and hot steam compressor (6) connected with low temperature multi-effect evaporator (7) having an outlet connected with first effect tube side inlet of product water pump (10).    USE - Nuclear power and low temperature multi-effect sea water desalination coupled co-production system.    ADVANTAGE - The system has high safety, good water quality, and good economical efficiency.    DETAILED DESCRIPTION - Nuclear power and low temperature multi-effect sea water desalination coupled co-production system comprises small nuclear reactor (1) connected with a steam generator (3) and a circulating pump (2), which are connected to form a main loop. The steam generator is connected with shell side outlet of steam turbine (4). The steam turbine is connected with tube side inlet of steam converter (5) having an outlet connected with condensed water subsequent processing device. The steam converter is connected with shell side outlet of hot steam compressor (6), which is connected with low temperature multi-effect evaporator (7) having an outlet connected with first effect tube side inlet of product water pump (10), which is connected with steam converter shell side inlet. The low temperature multi-effect evaporator is connected with water cooler (13), brine pump (11), seawater preheater (12), and condenser (8), which is connected with raw water inlet water supply pipeline. The condenser is connected with water pump (9) having an inlet connected with low temperature multi-effect evaporator. The seawater preheater is connected with water cooler.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of nuclear power and low temperature multi-effect sea water desalination coupled co-production system.    Small nuclear reactor (1)    Circulating pump (2)    Steam generator (3)    Steam turbine (4)    Steam converter (5)    Hot steam compressor (6)    Low temperature multi-effect evaporator (7)    Condenser (8)    Water pump (9)    Product water pump (10)    Brine pump (11)    Seawater preheater (12)    Water cooler (13)