A system for thermally recycling waste, for example whole used tyres (P) and fractionated waste; includes a first thermal pyrolysis column, having a first thermal base from which combustible gases are produced; a nozzle for introducing these combustible gases into a second instantaneous combustion and rapid reduction column and igniting them by injection of oxygen, this second reducing column having a second thermal base provided for carrying out purification of the burnt gases and molecular cracking; and a chute for introducing waste into this second column.