The invention relates to a method for preparing poly(epsilon-caprolactone) with attapulgite as a catalyst. The method for preparing epsilon-caprolactone with attapulgite as the catalyst is characterized in that the method comprises the following steps: 1) premixing monomer epsilon-caprolactone and the catalyst of attapulgite; 2) conducting the ring-opening polymerization: conducting microwave irradiation on the mixture in an anhydrous and anaerobic condition, and irradiating for 20-120min with a power of 50-1000w to to obtain a polymer; or reacting the mixture for 12-96h at a constant temperature of 25-28 DEG C in an anhydrous and anaerobic condition to obtain the polymer; and 3) separating and purifying to obtain poly(epsilon-caprolactone). According to the method, the attapulgite which is easily accessible and low in cost is used as the catalyst; and the method is low in production cost, and high in yield, and does not produce residual poisonous metal compounds.