The invention discloses a double-channel liquid metal magnetic fluid power generator. The double-channel liquid metal magnetic fluid power generator comprises a main hydraulic cylinder assembly and at least one set of power generation unit, wherein each power generation unit comprises an upper piston assembly, an upper transition section, a lower transition section, a lower piston assembly and an effective magnetic fluid power generation section; each upper piston assembly and each lower piston assembly are respectivelycommunicated with a main cylinder through an upper connecting pipe and a lower connecting pipe; each effective magnetic fluid power generation section comprises a first magnetic fluid power generation channel, a second magnetic fluid power generation channel, a magnet, a first electrode pair, a second electrode pair and an insulation plate; a sealed communicating space filled with liquid metal is formed among each upper piston assembly, each upper transition section, each first magnetic fluid power generation channel, each second magnetic fluid power generation channel, each lower transition section and each lower piston assembly. The double-channel liquid metal magnetic fluid power generator has the advantages that the manufacturing cost of the power generator is reduced, the usage amount of magnets is reduced, the weight and size of the power generator are further reduced, and the structure of the power generator is more compact.