The utility model relates to a calorimetric test's of coal residues of combustion gas filtering apparatus belongs to the coal quality detection test device field. The flowing back pipe is connected to absorption bottle top run -on trachea, bottom, nonrust steel pipe joint and absorption bottle top fixed connection, nonrust steel pipe of Z type and nonrust steel pipe joint cross -under, flexible rubber hose and nonrust steel pipe joint's upper end fixed connection, metal sintering powder filter core and nonrust steel pipe joint's lower extreme fixed connection. The advantage is novel structure, can be with the whole absorptive device of the acid gas of residues of combustion, and make the gas that discharges out not influence the air quality, convenient operation, assimilation effect are good, are applicable to all and give out heat the laboratory of survey, also can allocate the absorption liquid composition as required and absorb other acid gas and use in more chemistry are experimental.