The invention discloses an antistatic polyester finishing method. The antistatic polyester finishing method comprises the steps that 1, an antistatic agent is prepared, wherein the antistatic agent is prepared from, by mass, 10 parts of dimethyl terephthalate, 40 parts of ethylene glycol, 20 parts of polyethylene glycol, 10 parts of zinc cyclohexanebutyrate, 10 parts of calcium zinc stabilizer, 5 parts of antimony trioxide, 5 parts of tris(2-chloroethyl) phosphate, 3 parts of cresyl diphenyl phosphate and 3 parts of naphthyl phosphate disodium salt, and the raw materials perform transesterification and condensation polymerization reaction to obtain the antistatic agent; 2, a antistatic finishing fluid is prepared; 3, two times of dipping and two times of rolling are performed, wherein the pick-up rate is 80%; 4, drying is performed to obtain an antistatic polyester fiber. In the antistatic agent synthesis process, the characteristics of lower reaction temperature and short reaction time are shown, and the production costs are reduced. However, the antistatic polyester finishing method has better antistatic performance, and meanwhile the still good antistatic performance in the long-time usage process is improved.