A method for reducing organic chlorine compounds in a cement production facility by which a quantity of the organic chlorine compounds contained in exhaust gas generated on calcination of the cement clinker from cement raw materials is reduced in the cement production facility, the method for reducing organic chlorine compounds in the cement production facility comprising: a thermal decomposition step in which organic chlorine compounds contained in the cement raw materials which are limestone, clay, silica stone and iron material, are heated inside a raw material dryer the inside of which is kept at 300°C or higher, thus decomposing the organic chlorine compounds, while feeding the cement raw materials into the raw material dryer along with the introduction of the exhaust gas to the raw material dryer, thereby drying the cement raw materials by the exhaust gas; a step of separating the organic chlorine compounds from the cement raw materials in which the organic chlorine compounds are heated inside a raw material mill the inside of which is kept at 100°C or higher, while feeding the cement raw materials from the raw material dryer to the raw material mill along with the introduction of the exhaust gas to the raw material mill, thereby crushing into pieces; a step of collecting dust which has adsorbed the organic chlorine compounds from the exhaust gas while passing the exhaust gas discharged from the raw material dryer and the raw material mill through an electric dust collector; an organic matter adsorbing step in which an adsorbing powder is supplied into the exhaust gas from which the dust is collected, thus adsorbing the organic chlorine compounds on the adsorbing powder; and an adsorbing-powder removing step in which the adsorbing powder on which the organic chlorine compounds are adsorbed is collected using a bag filter which is provided with a bag-like filter cloth which is felt made with stretched PTFE fibers and on which an organic chlorine compound decomposing catalyst including titanium-vanadium based-catalysts is attached, thereby removing the adsorbing powder from the exhaust gas which has a temperature of 210°C to 230°C at the entrance of the filter. a thermal decomposition step in which organic chlorine compounds contained in the cement raw materials which are limestone, clay, silica stone and iron material, are heated inside a raw material dryer the inside of which is kept at 300°C or higher, thus decomposing the organic chlorine compounds, while feeding the cement raw materials into the raw material dryer along with the introduction of the exhaust gas to the raw material dryer, thereby drying the cement raw materials by the exhaust gas; a step of separating the organic chlorine compounds from the cement raw materials in which the organic chlorine compounds are heated inside a raw material mill the inside of which is kept at 100°C or higher, while feeding the cement raw materials from the raw material dryer to the raw material mill along with the introduction of the exhaust gas to the raw material mill, thereby crushing into pieces; a step of collecting dust which has adsorbed the organic chlorine compounds from the exhaust gas while passing the exhaust gas discharged from the raw material dryer and the raw material mill through an electric dust collector; an organic matter adsorbing step in which an adsorbing powder is supplied into the exhaust gas from which the dust is collected, thus adsorbing the organic chlorine compounds on the adsorbing powder; and an adsorbing-powder removing step in which the adsorbing powder on which the organic chlorine compounds are adsorbed is collected using a bag filter which is provided with a bag-like filter cloth which is felt made with stretched PTFE fibers and on which an organic chlorine compound decomposing catalyst including titanium-vanadium based-catalysts is attached, thereby removing the adsorbing powder from the exhaust gas which has a temperature of 210°C to 230°C at the entrance of the filter.