The invention discloses a synthesis method for 2,3-dibromo-1,4-butylene glycol. The invention aims to solve the technical problems of the prior art that the synthesis method for 2,3-dibromo-1,4-butylene glycol is complex, reaction conditions are harsh and unsafe, parameters are difficult to be controlled, production cost is high, product quality is low and use is limited. The synthesis method for2,3-dibromo-1,4-butylene glycol disclosed by the invention comprises the following steps: 1) adding a catalyst tetraethyl ammonium bromide into a dichloromethane solvent, and then dropwise adding liquid bromine while stirring, thereby acquiring a brominating agent tetraethyl ammonium bromide complex bromide; 2) adding butynediol into the dichloromethane solvent, triggering electrophilic addition reaction with the brominating agent tetraethyl ammonium bromide complex bromide prepared in the step 1), thereby generating 2,3-dibromo-1,4-butylene glycol; adding water for washing, cooling, separating 2,3-dibromo-1,4-butylene glycol crystal, and performing suction filtration, thereby acquiring a crude product of 2,3-dibromo-1,4-butylene glycol; 3) purifying the crude product of 2,3-dibromo-1,4-butylene glycol. The synthesis method provided by the invention can be widely applied to the technical field of chemical synthesis.