The treatment in a medium of supercritical water is one of the promising technologies for the complete and reliable oxidation of PCBs-contaminated transformer oil waste. An aqueous model waste solution was treated in a continuous supercritical water oxidation system, by controlling the relevant reaction variables of temperature, oxidant amount and residence time under isobaric condition, to obtain the kinetic data along the broad span of variables. The experimental data were reduced to a power-law type of global kinetic equation in terms of total organic carbon which is useful in the calculations and simulations for the design practice of the process. The resulting kinetic expression with its optimized parameters was proved to be able to reproduce the experimental conversions in an excellent agreement over the whole experimental range.