The invention aims to provide an organic waste gas catalytic purification device. According to the technical scheme, the organic waste gas catalytic purification device is composed of a front processing device, a preprocessing output pipeline, an accident emptying valve, a flame arrester, a catalytic purification unit, a purified gas delivery pipeline, a volume adjusting valve, a draught fan and a purified gas exhaust pipeline. The front processing device is further provided with a preprocessed gas inlet. The accident emptying valve is further provided with an emptying pipe. The catalytic purification unit is further provided with a waste gas inlet, a waste gas delivery pipe, a heat exchanger, a heat exchange gas output pipe, a catalyst chamber, a catalytic gas output pipe, a purified gas output pipe and a purified gas output port. The device is an output mechanism, the low-temperature oxidation technology is adopted, organic waste gas is converted into carbon dioxide and water at low temperature under the action of a precious metal catalyst, the gas is purified, and power consumption is low; safety performance is improved; and the organic waste gas catalytic purification device is small in occupied area, high in purification efficiency and applicable to purification treatment of common pollutants discharged by various chemical industries.