The present invention is to ensure the safety of people coexisting indoors by smoothly discharging the toxic gas generated indoors to the outside and at the same time continuously reducing the concentration of toxic gas in the air remaining indoors; Sensing means for detecting the concentration of toxic gas in the room; A control means configured to receive and operate the sensing data sensed by the sensing means, and to receive and control power from a power supply unit; An exhaust means configured to discharge indoor air to the outside by receiving power supplied through the control of the control means; In the indoor toxic gas reduction system comprising a; supply means for supplying the outdoor air to the room by receiving the power supplied through the control of the control means; The exhaust means includes an exhaust pump that pumps air by driving through control data of the control means, and an exhaust duct that spatially connects the room and the exhaust pump; The end of the exhaust duct is disposed at both corners of the indoor ceiling to collect the toxic gas that moves through the indoor wall and the ceiling; The supply means includes an intake pump that pumps air by driving through control data of the control means, and an intake duct that spatially connects the room and the intake pump; The end of the intake duct is disposed at both corners of the indoor floor surface to supply outdoor air to the indoor floor to provide an indoor toxic gas reduction system.
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