Discharge promoting machine for promoting discharge of air in cabin after efficient filtration

According to the exhaust promoting machine, a first ventilation opening is formed in the middle of the back face of an outer shell, a fixing plate is fixed to the middle of the back face of the outer shell, a second ventilation opening coinciding with the first ventilation opening is formed in the middle of the fixing plate, and an air ring is fixed to the position, located at the second ventilation opening, of the back face of the fixing plate; the air ring covers the second ventilation opening and is fixed to an air inlet of the draught fan, a rear cover shell is fixed to the back face of the outer shell, and a plurality of air outlet holes are formed in the rear cover shell. A U-shaped mounting plate with an opening facing the opposite side surface is fixed on the inner side surface of the outer shell, and a sterilizing lamp is mounted on the U-shaped mounting plate; limiting blocks are fixed to the periphery of the inner wall of the outer shell at intervals and form a limiting frame, and a first high-effi