To provide particulates burning method and a filter structure of an exhaust black smoke removing device which can reactivate the filter at a low temperature by adding fuel additive to fuel supplied to a diesel engine.

Exhaust gas from an engine 1 passes through a vent type porous filter 3. Particulates in the exhaust gas are captured by the filter 3 and burned. Fuel additive added to the fuel supplied to the engine is made up of liquid formed by solving oxydized catalyst containing at least one of cerium, cupper and iron into petroleum solvent. The filter is composed of silicon carbide. It is a honeycomb filter having a mean diameter size of minute holes of 14 micrometers, porosity of 40 to 50%, and thickness of 150mm in a direction for passing the exhaust gas.