Abstract: For preparing plastic waste composed of different plastics, possibly combined with other materials, for further processing, for example, as additives for construction. A method of the invention comminutes the waste, metals are separated out, the plastic waste is agglomerated, and the agglomerated waste is comminuted further. A device according to the invention for performing the method uses comminution devices, metal separators, and at least one agglomerator. The entire device is completely mobile and equipped with its own power supply.