Ion exchange resin treatment system for treating radioactive ion exchange resin waste, wherein a supercritical water oxidation reactor is connected on the inlet side with an air supply device, with a waste supply device, with a fuel supply device and a water supply device, wherein an ion exchange resin comminution system is connected upstream of the waste supply device and comminutes an ion exchange resin for treatment until the particle size of the ion exchange resin to be comminuted is below a predetermined ion exchange resin particle size, wherein the comminuted ion exchange resin is supplied to the waste supply device, wherein the supercritical water oxidation reactor is connected on the output side with a separator apparatus, wherein the mixture of gas and liquid obtained from the supercritical water oxidation reactor is separated into the respective phase by the separator apparatus and a separated gas is provided at a gas outlet element and a separated liquid is provided at a liquid outlet element, and wherein at least the supercritical water oxidation reactor, the air supply device, the waste supply device, the fuel supply device and the water supply device are regulated by a control device, characterized in that the ion exchange resin comminution system has a container from which a suspension of liquid and ion exchange resin is removed with a circulation pump and supplied to an ion exchange resin comminution apparatus, and in that the suspension of comminuted ion exchange resin and the liquid is conveyed back into the container through a conduit, in that the suspension is removed from the container by means of a removal pump and is supplied to a classification apparatus, in that the classification apparatus eliminates ion exchange resin which exceeds the specified ion exchange resin particle size from the suspension, in that at least the eliminated ion exchange resin particles are fed back into the container, and in that ion exchange resin which is equal to or smaller than the specified ion exchange resin particle size in a remaining liquid fraction is provided as a classified suspension at an exit element at the classification apparatus, in that the classified suspension provided by the classification apparatus is supplied to a concentration measuring apparatus, in that a concentration value of ion exchange resin particles in the suspension is determined by the concentration measuring apparatus, in that the classified suspension is provided for acceptance by a second pumping apparatus only when the concentration value determined is reached or exceeded in comparison to a stipulated concentration value, and in that if the concentration value is below the stipulated value, the classified suspension is passed back into the container. the ion exchange resin comminution system has a container from which a suspension of liquid and ion exchange resin is removed with a circulation pump and supplied to an ion exchange resin comminution apparatus, and in that the suspension of comminuted ion exchange resin and the liquid is conveyed back into the container through a conduit, in that the suspension is removed from the container by means of a removal pump and is supplied to a classification apparatus, in that the classification apparatus eliminates ion exchange resin which exceeds the specified ion exchange resin particle size from the suspension, in that at least the eliminated ion exchange resin particles are fed back into the container, and in that ion exchange resin which is equal to or smaller than the specified ion exchange resin particle size in a remaining liquid fraction is provided as a classified suspension at an exit element at the classification apparatus, in that the classified suspension provided by the classification apparatus is supplied to a concentration measuring apparatus, in that a concentration value of ion exchange resin particles in the suspension is determined by the concentration measuring apparatus, in that the classified suspension is provided for acceptance by a second pumping apparatus only when the concentration value determined is reached or exceeded in comparison to a stipulated concentration value, and in that if the concentration value is below the stipulated value, the classified suspension is passed back into the container.