The invention relates to a device and method for purifying ethanediol based on suspension melt crystallization of a revolving bed in the technical field of chemicrystallization purification. The device comprises a feed solution cooler, a feed solution solid-liquid separator, an extraction reflux cooler, an extraction reflux solid-liquid separator, an extraction revolving bed, a purification revolving bed and a heater. In the invention, a silk screen filler revolving bed is used as a suspension crystallizer, tiny solid particles settle from middle to outside under the action of a centrifugal force, and liquid enters from the outer edge of the revolving bed and is introduced from the middle, and heat and mass transfer is carried out through reverse contact between the solid particles and the liquid, therefore, the ethanediol is completely separated from 1,2-propanediol and 1,2-butanediol.