NOVELTY - An offshore wave energy-generating and sea water desalination combination device has supporting platform (10), floating body (1), pre-processing tank (2), water pump (3), reverse osmosis membrane module (4), thrust jar (5), vibrating tubular linear generator (6), fresh water tank (7), freshwater piston pump (8), and hydraulic generator (9) in which pre-processing tank, water pump, fresh water tank, freshwater piston pump are arranged on upper supporting platform and fresh water piston rod (31) and fresh water piston pump are fixedly connected to floating body by coupling rod (811).    USE - Offshore wave-generating and sea water desalination combination device (claimed).    ADVANTAGE - The device uses wave energy efficiently, can discharge large power current output with high frequency, automatically conveys fresh water to land, has high energy efficiency rate, and reduces power generation and fresh water cost.    DETAILED DESCRIPTION - An offshore wave energy-generating and sea water desalination combination device has supporting platform, floating body, pre-processing tank, water pump, reverse osmosis membrane module, thrust jar, vibrating tubular linear generator, fresh water tank, freshwater piston pump, and hydraulic generator in which pre-processing tank, water pump, fresh water tank, freshwater piston pump are arranged on upper supporting platform, fresh water piston rod and fresh water piston pump are fixedly connected to floating body by coupling rod, pre-processing tank is connected with connecting water pipe inlet (21), water pump water inlet (32) is connected with pre-processing tank and provided with a single valve (321), water pump water outlet (33) is connected with reverse osmosis membrane module inlet (41) and has one-way valve (331), reverse osmosis membrane module water outlet (42) is connected with thrust jar inlet (55) and has one-way valve (421), reverse osmosis membrane module freshwater outlet (43) is connected with fresh water tank, fresh water piston pump inlet (82) is connected with freshwater tank and provided with single valve (821), fresh water piston pump outlet (83) is connected to fresh water conveying tube (84), and fresh water conveying tube outlet is fixedly installed on hydraulic generator.    DESCRIPTION OF DRAWING(S) - The drawing shows a structural schematic diagram of an offshore wave-generating and sea water desalination combination device.    Floating body (1)    Pre-processing tank (2)    Water pump (3)    Reverse osmosis membrane module (4)    Thrust jar (5)    Vibrating tubular linear generator (6)    Fresh water tank (7)    Fresh water piston pump (8)    Hydraulic generator (9)    Supporting platform (10)    Connecting water pipe inlet (21)    Fresh water piston rod (31)    Water pump water inlet (32)    Water pump water outlet (33)    Reverse osmosis membrane module inlet (41)    Reverse osmosis membrane module water outlet (42)    Reverse osmosis membrane module freshwater outlet (43)    Thrust jar inlet (55)    Fresh water piston pump inlet (82)    Fresh water piston pump outlet (83)    Water pump single valve (321)    Water pump outlet one-way valve (331)    Reverse osmosis membrane module outlet one-way valve (421)    Coupling rod (811)    Fresh water piston pump single valve (821)