The invention relates to the technical field of electro-chemical water treatment, particularly to a merged propeller blade type electro-catalytic reactor for high-viscosity wastewater treatment. The structure of the electro-catalytic reactor comprises a casing, an upper floating head, a lower floating head, a base, propeller blade anodes, propeller blade cathodes, a conducting shaft, anode guide plates, cathode guide plates, insulation guide plates, an axial flow motor, and auxiliary components, wherein the casing, the upper floating head, the lower floating head and the base are used for protecting and supporting the reactor; the propeller blade anodes, the propeller blade cathodes, the conducting shaft, the anode guide plates, the cathode guide plates and the insulation guide plates are used for providing a reaction field for electrocatalysis; the axial flow motor is used for providing driving force for the flow of water bodies; the auxiliary components comprise a water inlet pipe, a water outlet pipe, a cleaning pipe, a residue discharge pipe and the like. After high-viscosity waste water enters a system through the water inlet pipe, and the high-viscosity waste water is uniformly distributed and violently disturbed under the stirring action of the propeller blades, so that the short pass of water flows is avoided, the mass transfer effect is also enhanced, waste water generates an oxidation reaction in the propeller blade anodes and generates a reduction reaction on the propeller blade cathodes alternately, and the effective degradation of different organic pollutants is smoothly realized.