Provided is a method for a
continuous production of biodegradable aliphatic / aromatic
polyester, the method comprising the steps of: reacting an aliphatic dihydroxy compound and aliphatic
dicarboxylic acid at 185℃ or lower in a primary ester reaction; continuously reacting the product obtained from the previous step in a secondary ester reaction; reacting the product obtain from the previous step in a continuous primary
polycondensation reaction and obtaining a preliminary
polymer having a weight-average molecular weight of 6,900-14,000; reacting the preliminary
polymer in a continuous secondary
polycondensation reaction and obtaining a product therefrom; and reacting the product obtained from the previous step in a continuous
tertiary polycondensation reaction, and the biodegradable aliphatic / aromatic
polyester polymer is produced by adding an aromatic
dicarboxylic acid in the step for the first ester reaction or in the step for the continuous second ester reaction. The method for a
continuous production of biodegradable aliphatic / aromatic
polyester as described above allows obtaining a biodegradable aliphatic / aromatic polyester having superb processability, capability for film formation, tensile and tear strengths, and blending capability with other
polymer resin, and additionally, reduces the quantity consumed of the aliphatic dihydroxy compound, which is a starting material, thereby reducing the per unit production costs.