The invention relates to a preparation method of an antistatic, anti-balling, and ordinary pressure cation dyeable polyester chip, comprising the following steps: a primary esterification reaction step, an ester exchange reaction step, a secondary esterification reaction step, and a polymerization reaction step, wherein, a ternary-monomer is added in the ester exchange reaction step, hindered anime light stabilizers, hindered phenol antioxygens and hydroxyl silicone oil are added after the ester exchange reaction and before a prepolymerization reaction, and an antistatic agent is added after the prepolymerization of the polymerization reaction step and before a final polymerization. Fabrics prepared from polyester fibers produced by using the polyester chips disclosed herein have good antistatic behavior and good anti-balling behavior, and have unlimited dyeing possibilities by using the ordinary pressure cation dyeability, thus the uniform requirements of present high-grade spring and summer clothes for functionality and colors can be satisfied. The obtained fibers can be dyed with wool together, and the blending of the fibers with wool has good dress effect. The polyester chips and fibers disclosed herein are an important supplement of present cation dyeable polyester fiber market, and have a wide market prospect.