Polyester bulked filament and preparation method thereof

The invention discloses a polyester bulked filament and a preparation method thereof. The polyester bulked filament comprises the following components in parts by weight: 30-50 parts of polyethylene glycol terephthalate, 20-30 parts of normal-pressure cationic dyeable polyester, 20-30 parts of dimethyl isophthalate-5-sodium sulfonate, 15-25 parts of a degradable additive, 8-15 parts of a negativeion additive, 1-2 parts of a fluorescent whitening agent and 5-8 parts of an oiling agent. The invention belongs to the technical field of synthetic fiber processing, and particularly provides a polyester bulked filament and a preparation method thereof, the degradable additive and negative ion additive can be added while the polyester bulked filament is prepared, so that the prepared polyester bulked filament can release negative ions; meanwhile, the polyester bulked filament can be more easily biodegraded after being discarded, the spinning raw materials are dried before spinning, and the problems that the polymeriz