A method for preparing chlorohydrins composition, the method comprising: introducing polyhydroxy aliphatic hydrocarbon, a catalyst, and a chlorination agent into a first reactor in which the temperature is maintained in a range of 50 to 200°C, wherein the polyhydroxy aliphatic hydrocarbon is a C 2 to C 20 compound that contains two or more hydroxyl groups bonded to different carbon atoms; discharging an effluent of the first reactor comprising water as a by-product from the first reactor; introducing at least a portion of the effluent of the first reactor effluent into a water removal device to separate it into a water-rich layer and a water-deficient layer; introducing the water-deficient layer and an additional chlorination agent into a second reactor in which the temperature is maintained in a range of 80 to 200°C; introducing at least a portion of an effluent of the second reactor into a chlorohydrins purification device to obtain chlorohydrins concentrate; mixing the water-rich layer with the chlorohydrins concentrate, or adding water to the resulting mixture after the mixing to obtain chlorohydrins composition; and contacting the chlorohydrins composition with an alkaline agent to remove the catalyst included in the chlorohydrins composition in the form of an alkali metal salt, wherein a reaction product of the catalyst and the polyhydroxy aliphatic hydrocarbon is produced as the intermediate product in the first reactor, and the intermediate product is introduced into the second reactor and acts as a catalyst in a chlorination reaction of the polyhydroxy aliphatic hydrocarbon, wherein the first reactor effluent introduced into the water removal device includes 10 to 25 parts by weight of the total of the chlorination agent and 75 to 90 parts by weight of water so that the first reactor effluent forms an azeotropic mixture, and without further adding a catalyst in the second reactor, wherein the polyhydroxy aliphatic hydrocarbon comprises at least one compound selected from the group consisting of 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 3-chloro-1,2-propanediol, 2-chloro-1,3-propanediol, glycerol, 1,2,4-butanetriol, 1,4-butanediol, and esters of these compounds and wherein the catalyst comprises an organic acid catalyst selected from the group consisting of a monocarboxylic acid, a dicarboxylic acid, a polycarboxylic acid, a malonic acid, a levulinic acid, a citric acid, a succinic acid, and a propionic acid, wherein the water removal device is a distillation column. introducing polyhydroxy aliphatic hydrocarbon, a catalyst, and a chlorination agent into a first reactor in which the temperature is maintained in a range of 50 to 200°C, wherein the polyhydroxy aliphatic hydrocarbon is a C 2 to C 20 compound that contains two or more hydroxyl groups bonded to different carbon atoms; discharging an effluent of the first reactor comprising water as a by-product from the first reactor; introducing at least a portion of the effluent of the first reactor effluent into a water removal device to separate it into a water-rich layer and a water-deficient layer; introducing the water-deficient layer and an additional chlorination agent into a second reactor in which the temperature is maintained in a range of 80 to 200°C; introducing at least a portion of an effluent of the second reactor into a chlorohydrins purification device to obtain chlorohydrins concentrate; mixing the water-rich layer with the chlorohydrins concentrate, or adding water to the resulting mixture after the mixing to obtain chlorohydrins composition; and contacting the chlorohydrins composition with an alkaline agent to remove the catalyst included in the chlorohydrins composition in the form of an alkali metal salt, wherein a reaction product of the catalyst and the polyhydroxy aliphatic hydrocarbon is produced as the intermediate product in the first reactor, and the intermediate product is introduced into the second reactor and acts as a catalyst in a chlorination reaction of the polyhydroxy aliphatic hydrocarbon, wherein the first reactor effluent introduced into the water removal device includes 10 to 25 parts by weight of the total of the chlorination agent and 75 to 90 parts by weight of water so that the first reactor effluent forms an azeotropic mixture, and without further adding a catalyst in the second reactor, wherein the polyhydroxy aliphatic hydrocarbon comprises at least one compound selected from the group consisting of 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 3-chloro-1,2-propanediol, 2-chloro-1,3-propanediol, glycerol, 1,2,4-butanetriol, 1,4-butanediol, and esters of these compounds and wherein the catalyst comprises an organic acid catalyst selected from the group consisting of a monocarboxylic acid, a dicarboxylic acid, a polycarboxylic acid, a malonic acid, a levulinic acid, a citric acid, a succinic acid, and a propionic acid, wherein the water removal device is a distillation column.