To solve the problem that capturing soot by a filter means is very difficult and impossible to clarify unless there is a clear solution to securing application to a mobile diesel engine device and fixed diesel engine device.

An exhaust gas post-treatment system for reducing particulates, NOx, HC, CO, VOC, nano particulates, and sulfur dioxide, which are discharged from a diesel engine, uses an oxide catalyst, an exhaust gas cooling system, a particulate conversion furnace, a soot collecting chamber, a soot treatment drum, an EGR, and a water scrubber.