The invention discloses a regeneration treatment method and device of electronic waste plastic. The regeneration treatment method comprises the steps of step I, crushing and magnetic separation: smashing electronic waste plastic, and carrying out magnetic separation; step II, primary gravity separation: carrying out separation to obtain a heavy-component material and a light-component material; step III, secondary gravity separation: separating out polyene plastic and styrene plastic; step IV, foam flotation: carrying out foam flotation on polyene plastic, separating out PP and PE, carrying out foam flotation on styrene plastic, and separating out ABS and PS; and step V, regeneration and granulation: carrying out drying, mixing, plasticizing and granulation, so as to obtain PP regeneration particles, PE regeneration particles, ABS regeneration particles and PS regeneration particles. According to the regeneration treatment method, magnetic metals, nonmagnetic metals, PP, PE, ABS and PS are accurately separated, and compared with a traditional technology which can only separate a small part and is serious in waste and complex in technology, the regeneration treatment method has the advantages that plastic and metals can be accurately sorted, the treatment effect is good, and purity of a product is high.