The present invention provides an indoor toxic gas reduction system to effectively discharge toxic gas created indoors to outdoor space and continuously reduce a toxic gas concentration in the air remaining indoors to secure the safety of people coexisting indoors. The indoor toxic gas reduction system comprises: a detection means to detect an indoor toxic gas concentration; a control means to receive and calculate detection data detected by the detection means, and receive and control power of a power supply unit; an exhaust means to receive power supplied by control of the control means to discharge indoor air to the outside; and a supply means to receive power supplied by control of the control means to supply outdoor air to indoor space. The exhaust means includes an exhaust pump driven by control data of the control means to pump air, and an exhaust duct spatially connecting indoor space and the exhaust pump. The ends of the exhaust duct are arranged on both corner portions on an indoor ceiling to collect toxic gas moved via an indoor wall surface and ceiling surface. The supply means includes an intake pump driven by control data of the control means to pump air, and an intake duct spatially connecting indoor space and the intake pump. The ends of the intake duct are arranged on both corner portions on an indoor floor surface to supply outdoor air to the indoor floor.;COPYRIGHT KIPO 2020
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