Plant for the treatment, by wet oxidation, of dangerous organic waste mainly in the solid and liquid form, in particular radioactive waste, containing inorganic loads and organic loads, and optionally bioorganic substances, characterized in that it comprises: - a closed and leaktight chamber provided with an inlet for the waste to be treated and with an outlet for the treated waste; the said inlet being produced in the form of a controlled air lock; - means for transporting, in a form confined in hermetically sealed drums, a volume of the said dangerous organic waste, the said means comprising a conveyor belt which passes through the said inlet, in order to transport the said waste on the conveyor belt; - a hoist for transporting the said drums above a mixing vessel, - means for automatically sawing the drums in two in order to make it possible to pour their contents into the said mixing vessel, - the said mixing vessel, in order to add, to the said predetermined volume, a given amount of water mixed with a base for the purpose of adjusting the pH to a predetermined value, in order to form a solution and/or a liquid suspension, - a pressure reactor and means for decanting, into the said pressure reactor, the said solution and/or the said liquid suspension, - a device for introducing, into the said pressure reactor, an oxygen atmosphere and for placing the said atmosphere under a pressure of between 40 and 200 bar sufficient to maintain the water in the liquid form in the said pressure reactor, - a stirring device for stirring the said solution and/or the said liquid suspension confined in the said pressure reactor, - a heating installation for subjecting the said pressure reactor with its contents to a heat treatment at a temperature substantially of between 150 and 350°C and preferably in the vicinity of 300°C for a predetermined period of time to finalize the said wet oxidation, in order to carry out the said treatment under "subcritical" conditions, the water being maintained in the liquid state, and - means for discharging the said treated waste in a safe manner for the purpose of its storage or of its removal. - a closed and leaktight chamber provided with an inlet for the waste to be treated and with an outlet for the treated waste; the said inlet being produced in the form of a controlled air lock; - means for transporting, in a form confined in hermetically sealed drums, a volume of the said dangerous organic waste, the said means comprising a conveyor belt which passes through the said inlet, in order to transport the said waste on the conveyor belt; - a hoist for transporting the said drums above a mixing vessel, - means for automatically sawing the drums in two in order to make it possible to pour their contents into the said mixing vessel, - the said mixing vessel, in order to add, to the said predetermined volume, a given amount of water mixed with a base for the purpose of adjusting the pH to a predetermined value, in order to form a solution and/or a liquid suspension, - a pressure reactor and means for decanting, into the said pressure reactor, the said solution and/or the said liquid suspension, - a device for introducing, into the said pressure reactor, an oxygen atmosphere and for placing the said atmosphere under a pressure of between 40 and 200 bar sufficient to maintain the water in the liquid form in the said pressure reactor, - a stirring device for stirring the said solution and/or the said liquid suspension confined in the said pressure reactor, - a heating installation for subjecting the said pressure reactor with its contents to a heat treatment at a temperature substantially of between 150 and 350°C and preferably in the vicinity of 300°C for a predetermined period of time to finalize the said wet oxidation, in order to carry out the said treatment under "subcritical" conditions, the water being maintained in the liquid state, and - means for discharging the said treated waste in a safe manner for the purpose of its storage or of its removal.