The invention provides a module group radiator series type water-cooled SVG valve stack, comprising a bottom channel-steel frame, support composite insulators, upper and lower square steel frames, a frame formed by I-shaped steel and steel in the shape of a Chinese character ''wang'', module groups, copper bars, fibers, and water pipes. A module group radiator series type is used for the water-cooled SVG valve stack, water inlets and outlets of the radiators are provided with electrodes, the composite insulators are used for supporting the frame formed by two columns of the I-shaped steel and steel in the shape of a Chinese character ''wang'', all the module groups are successively connected in a series type via the copper bars, a mode of left and right inlet and outlet is used for a valve stack water path, electrodes are disposed at two ends of interlayer water pipes, and are equipotential with a nearest module group. The water-cooled SVG valve stack is advantageous in that structure is compact, and occupied area is small; a fewer water adaptors are used by a single module group in average, and water leakage risk is lower; a series type is used for module group radiator water pipes, and assembly is simple; and the electrodes are disposed in the radiator, and radiator corrosion is prevented.