The present invention relates to a tri-reformer reactor and to a tri-reformer reaction system using same, wherein the tri-reformer reactor comprises: a tri-reformer reaction unit in which are accumulated multi-channel reaction modules in which a tri-reforming catalyst is dispersed; a raw-material supply nozzle for supplying raw-material gases, namely natural gas, steam and carbon dioxide, to the tri-reformer reaction unit; a catalyst combustion burner which is placed in the centre of the reactor, surrounded by the multi-channel reaction modules, and is provided with a combustion unit in which a combustion catalyst is loaded; a supply nozzle for respectively introducing an oxidising agent and a natural gas into the catalyst combustion burner; and a plurality of supply nozzles formed in the combustion unit in order to supply the combustion catalyst with the oxidising agent and the natural gas that have been introduced into the catalyst combustion burner. The present invention can be used in a plant where a clean fuel such as DME or GTL is produced, and, when used in a commercial plant, makes it possible to reduce the volume of a reactor producing synthesis gas by approximately 50% and makes it possible to produce synthesis gas having the same performance even while reducing production costs.
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