Method for recovering plastic from complex materials; comprising, at least, the following steps: successive grindings of the complex product into granules of 8 to 12 millimetres, 4 to 6 millimetres and a size equal to or less than 2 millimetres, performing, after each grinding, the separation of the polyester fluff from the remaining mixture of plastic with polyester, finally subjecting the remaining mixture to successive agitations and removals of the polyester fluff by sifting, aspiration, blowing and/or propulsion, until plastic with a purity of 99.99% is obtained.