Digital display oxygen index tester

The utility model discloses a digital display oxygen index tester which comprises a base, a tester and a combustion part are arranged on the base, the combustion part comprises a tube seat fixedly connected with the base, an oxygen supply tube is fixedly connected in the tube seat, a fixing clamp is movably arranged on the oxygen supply tube, and a glass tube is sleeved on the tube seat in a sliding mode. A filter is movably arranged at the end of the glass tube and comprises a filter tube and a filter sponge positioned in the filter tube; the bottom of the filter tube is slidably connected with the glass tube; the filter sponge is slidably connected with the filter tube; according to the utility model, through the arrangement of the filter, when an object to be measured is measured, generated fly ash can be filtered and stored through the filter, so that the fly ash is prevented from drifting away to cause pollution to air; through the arrangement of the fixing clamp, the to-be-measured object can be conveni