The present invention relates to a diesel particulate filtering system for filtering exhaust gas exhausted from a diesel engine using an electrostatic precipitation type diesel particulate filter and more specifically, to a diesel particulate filtering system for a diesel engine using an electrostatic precipitation type diesel particulate filter capable of preventing the reduction of efficiency caused when a number of generated ions are reduced by filtering exhaust gas exhausted from a diesel engine using the diesel particulate filter, but preventing the phenomenon in which the insulated state is broken by dust contained in the exhaust gas using the exhaust gas. [Reference numerals] (AA) Outdoor air