The invention provides a soot collection quantity measuring device for a diesel particulate filter. The soot collection quantity measuring device for a diesel particulate filter includes: an anion charging unit that is provided in an exhaust pipe in front of a diesel particulate filter and has a plurality of conductor flat plates in parallel with one another, and a capacitor that is provided at the back of the anion charging unit and has upper and lower electrode plates connected to a direct-current high-voltage power supply. The soot particulates pass through the anion charging unit which is negatively charged, and the charged soot particulates are collected in the upper electrode plate by an electric field between the upper and lower electrode plate.