With reference to FIG. 1, the system for preparing a vanadium battery high-purity electrolyte used in this example comprises a vanadium oxytrichloride storage tank 1, a liquid phase hydrolysis device 2, a vanadium pentoxide feeding device 3, a preheating system 4, a reduction fluidized bed 5, a combustion chamber 6, a cooling system 7, a secondary cooling system 8, a low-valence vanadium oxide feeding device 9, a dissolution reactor 10 and an activation device 11.

The liquid phase hydrolysis device 2 comprises a liquid phase hydrolysis reaction tank 2-1 and a washing filter 2-2.

The vanadium pentoxide feeding device 3 comprises a vanadium pentoxide hopper 3-1 and a vanadium pentoxide screw feeder 3-2.

The preheating system 4 comprises a venturi preheater 4-1, a primary cyclone preheater 4-2, a secondary cyclone preheater 4-3 and a bag-type dust collector 4-4.

The reduction fluidized bed 5 comprises a feeder 5-1, a bed body 5-2, a discharger 5-3, a gas heater 5-4, a gas purifier 5-5 and a first cyclone separator 5-6.

The cooling system 7 comprises a venturi cooler 7-1, a cyclone cooler 7-2 and a second cyclone separator 7-3.

The low-valence vanadium oxide feeding device 9 comprises a low-valence vanadium oxide hopper 9-1 and a low-valence vanadium oxide screw feeder 9-2.