The invention discloses an efficient recognition and separation method for waste plastic, and relates to the technical field of waste plastic regeneration. The method comprises the following steps of(1) cleaning attachments; (2) carrying out crushing and cleaning; (3) positioning standard plastic; and (4) separating the waste plastic. According to the method, attached impurities such as labels, pulp and grease attached to the surface of the waste plastic can be removed in a sedimentation mode through a sedimentation agent, the internal molecular structure and composition cannot be damaged, after the waste plastic is crushed into pieces of uniform standard, accelerating is performed by utilizing electrification by friction, due to the fact that the densities of different plastic are different, the general category of the waste plastic can be determined firstly according to the comparison of the positioning range and the movement track of the standard plastic, and then subsequent processing regeneration can be facilitated. The method has the advantages of being energy-saving, efficient, environment-friendly, low in cost, capable of being repeatedly used and suitable for large-scaleindustrial production.