The invention relates to a movable fire-extinguishing and smoke-exhausting device for an indoor large space, which comprises a guide slide rail, a walking mechanism, a bearing shell, a smoke purifier, a drainage fan, a fire extinguishing agent storage tank, a spraying pump, a spraying head, an auxiliary paddle, a driving motor and a driving circuit, wherein the bearing shell is slidably connected with the guide slide rail through the walking mechanism, the smoke purifier is connected with the bearing shell; the driving motor is connected with the auxiliary blade and the spraying head through the transmission mechanism, the auxiliary blade is located in the bearing shell, the spraying head is located outside the bearing shell, and the driving circuit is embedded in the outer surface of the bearing shell. On the one hand, the requirement for use of various building indoor space structure matched running agents can be effectively met, the construction cost is low, and the construction difficulty is small; on the other hand, fire can be extinguished, a smog environment caused by the fire can be purified and cleaned, and the internal environment of a fire scene is improved.