A device for plasma treatment of solid waste includes: a casing defining a treatment volume; a plasma torch including a first electrode and a second electrode that face into the treatment volume; an inlet port for intake of solid waste to be treated; an outlet port for disposal of inert solid products of reaction; a supply port for intake of a gas for supplying the aforesaid plasma torch; and a discharge port for discharge of gaseous products of reaction. The first electrode and the second electrode are arranged opposed to one another, and the casing is mounted rotatable about an axis of rotation. A treatment system is also provided incorporating the treatment device.