A heat sealable polyester film characterized in that it is formed from a recycled polyester material, the heat sealable polyester film comprising: a base layer; and a heat sealable layer disposed on at least one surface of the base layer, the heat sealable layer formed from a first polyester composition, the first polyester composition including a physically regenerated polyester resin and a chemically regenerated polyester resin, and a main component of each of the first polyester composition, the physically regenerated polyester resin and the chemically regenerated polyester resin is regenerated polyethylene terephthalate, and the first polyester composition further including at least one of 1,4-butanediol, isophthalic acid, neopentyl glycol, and polybutylene terephthalate; wherein, based on a total weight of the first polyester composition being 100 wt%, a content of the physically regenerated polyester resin ranges from 50 wt% to 95 wt%, a content of the chemically regenerated polyester resin ranges from 1 wt% to 40 wt%, and a total content of the physically regenerated polyester resin and the chemically regenerated polyester resin ranges from 50 wt% to 100 wt%; wherein the chemically regenerated polyester resin is formed from chemically regenerated polyester chips, the chemically regenerated polyester chips include chemically regenerated regular polyester chips, chemically regenerated modified polyester chips, and chemically regenerated electrostatic pinning polyester chips; whererin, the chemically regenerated regular polyester chips are polyester chips prepared through a chemical reproduction process and no functional additive being added during the chemical reproduction process; whererin the chemically regenerated modified polyester chips includes regenerated polyethylene terephthalate as a main component and residue that is derived from at least one of 1,4-butanediol, isophthalic acid, and neopentyl glycol in a chemical reaction; based on a total weight of the chemically regenerated modified polyester chips being 100 wt%, the chemically regenerated modified polyester chips include 0 wt% to 30 wt% of 1,4-butanediol residue that is derived from 1,4-butanediol in a chemical reaction, 0 wt% to 30 wt% of isophthalic acid residue that is derived from isophthalic acid in a chemical reaction, and 0 wt% to 30 wt% of neopentyl glycol residue that is derived from neopentyl glycol in a chemical reaction; wherein a heat sealing temperature of the heat sealable polyester film ranges from 120°C to 230°C. a base layer; and a heat sealable layer disposed on at least one surface of the base layer, the heat sealable layer formed from a first polyester composition, the first polyester composition including a physically regenerated polyester resin and a chemically regenerated polyester resin, and a main component of each of the first polyester composition, the physically regenerated polyester resin and the chemically regenerated polyester resin is regenerated polyethylene terephthalate, and the first polyester composition further including at least one of 1,4-butanediol, isophthalic acid, neopentyl glycol, and polybutylene terephthalate; wherein, based on a total weight of the first polyester composition being 100 wt%, a content of the physically regenerated polyester resin ranges from 50 wt% to 95 wt%, a content of the chemically regenerated polyester resin ranges from 1 wt% to 40 wt%, and a total content of the physically regenerated polyester resin and the chemically regenerated polyester resin ranges from 50 wt% to 100 wt%; wherein the chemically regenerated polyester resin is formed from chemically regenerated polyester chips, the chemically regenerated polyester chips include chemically regenerated regular polyester chips, chemically regenerated modified polyester chips, and chemically regenerated electrostatic pinning polyester chips; whererin, the chemically regenerated regular polyester chips are polyester chips prepared through a chemical reproduction process and no functional additive being added during the chemical reproduction process; whererin the chemically regenerated modified polyester chips includes regenerated polyethylene terephthalate as a main component and residue that is derived from at least one of 1,4-butanediol, isophthalic acid, and neopentyl glycol in a chemical reaction; based on a total weight of the chemically regenerated modified polyester chips being 100 wt%, the chemically regenerated modified polyester chips include 0 wt% to 30 wt% of 1,4-butanediol residue that is derived from 1,4-butanediol in a chemical reaction, 0 wt% to 30 wt% of isophthalic acid residue that is derived from isophthalic acid in a chemical reaction, and 0 wt% to 30 wt% of neopentyl glycol residue that is derived from neopentyl glycol in a chemical reaction; wherein a heat sealing temperature of the heat sealable polyester film ranges from 120°C to 230°C.