The present invention discloses a method for preparing polyester hot melt adhesive with quick crystallization performance. The method for preparing the polyester hot melt adhesive comprises the following steps: mixing and pulping terephthalic acid and a C2-C4 dibasic alcohol-titanium/tin composite catalyst, adding the pulp into an esterfiying kettle and heating the pulp for primary esterification; (2) mixing and pulping m-phthalic acid, C8-C12 aliphatic dibasic acid, C2-C5 dibasic alcohol and a stabilizing agent for secondary esterification; and (3) performing pressure reduction and polycondensation and adding a nucleating agent mono-sylvite terephthalate and nanoscale microencapsulated calcium carbonate to obtain the polyester hot melt adhesive. The polyester hot melt adhesive is particularly applied in the industries of garment interlining, shoemaking and the like. Through the method of the invention, not only the crystallization time of polyester is shortened, but also the nucleating agent is dispersed uniformly, thus the performance of materials is greatly improved.