Abstract: The cross-linking SBS hybrid bipolar membrane(SBS BPM) was prepared by free radical reaction of SBS(styrene-butadiene-styrene triblock copolymer) with acrylic acid(AA),sulfonic styrene(StSO₃H) and γ-methacryloxypropyltrimethoxysilane(KH-570) as the anode membrane,and reaction of SBS with dimethyl amino ethyl methacrylate(DMAEMA) and KH-570 as the cathode membrane.Cross-linking reaction was carried out through sol-gel reaction of trimethoxysilane group.SBS BPM exhibited high temperature tolerance(thermal degradation temperature in N₂,T_d was up to 186.5℃).The ion exchange capacities(IECs) of the anode and cathode membranes were 1.51 and 2.71 mmol/g,respectively.SBS hybrid bipolar membranes were used as the separator in the electrolysis cell,then using tungstate/pertungstate as the media to indirect electrooxidate maleic acid to prepare trans-2,3-oxiranedicarboxylic acid in the cathode chamber.Graphite was used as the anode and cathode electrode.At 50℃ and when the current density was 2.0 × 10^-2 A/cm² for 4 h,the yield and average current efficiency of trans-2,3-oxiranedicarboxylic acid were 53.0% and 40.8%,respectively.