Polyester composition, preparation method therefor and application thereof

A polyester composition, comprising: (1) a first polyester selected from one or more of aliphatic-aromatic copolyesters, being a copolymer comprising repeating units A as shown in formula (I) and repeating units B as shown in formula (II), wherein m is an integer of 2 to 10 and n is an integer of 2 to 8; p is an integer of 2 to 10; and m, n and p are the same or different from each other; and (2) optionally a second polyester; wherein the polyester composition comprises at least two polyesters. The polyester composition is useful in shape memory materials, 3D printed wires, heat shrink sleeves, functional layers, medical limb immobilization braces, heat shrinkable thin films, nonwoven fabrics, elastic fibers, etc.