A method and a plant for producing secondary solid fuel (SSF) provide for removing fine and heavy waste from a flow of treated waste and further subdividing the remaining waste into intermediate waste and light waste. Only the fraction of intermediate waste is subjected to removal of chlorinated plastics (PVC). Advantageously, thanks to the fact that only a small fraction of the treated waste is subjected to removal of the chlorinated plastics, high efficiency in the treatment of waste and in the production of SSF is obtained. Preferably, the intermediate waste fraction is also subjected to removal of ferrous metals and non-ferrous metals, such as aluminum.