A waste plastic container recycling system and a method thereof are provided for determining whether the spectrum of a waste container to be recycled belongs to any one of spectrums of plastic materials and for classifying waste containers of different plastic materials since the plastic materials have the different spectral characteristics. Accordingly, the waste plastic container recycling system and the method thereof can accurately recognize the waste containers of different plastic materials regardless of the appearance, or damage, deformation or concealment of the label on the waste containers.