The invention discloses automatic separation equipment of waste mixed plastics and a method thereof. The equipment comprises an automatic control system, an electromagnetic vibration feeding system, a conveying belt, a color inductor array, a pneumatic nozzle, a pure material collecting bin, an automatic push rod and a waste collector. The method comprises the following steps: (1) crushed and deironed piece-shaped or particle-shaped plastic products are fed onto the conveying belt by the electromagnetic vibration feeding system; (2) mixed plastic particles supported by the conveying belt are screened with colors through different color inductors in the color inductor array and the pneumatic nozzle in sequence, and are collected by the pure material collecting bin; and (3) wastes not identified by the color inductor array on the conveying belt are pushed into the waste collector by the automatic push rod after passing through the final color inductor. The method adopts a high-tech method to replace manual sorting, so that the production labor force is reduced; and compared with manual sorting, the method is faster in speed, is stronger in continuity, and greatly improves the production efficiency.