in this paper，the electrocatalytic oxidation degradation of fracturing flowback fluid was studied，and the effects of treatment conditions，such as treatment time，treatment temperature and current density，on the viscosity and boron form of simulated hydroxypropyl guar gum based fracturing flowback fluid，as well as the effects of direct oxidation caused by electron exchange between electrode plate and guar gum and indirect oxidation caused by an active oxide produced by an electrochemical process on the degradation of hydroxypropyl guar gum were investigated. The results showed that the viscosity reduction rate of the fracturing flowback fluid increased as follows，treatment time＞100 min，treatment temperature＞25℃，current density≥70 A/m2 and［Cl-］≥4855 mg/L. Indirect oxidation and direct oxidation played a synergistic role in the degradation process of electrocatalytic oxidation. During the viscosity reduction process of the fracturing flowback fluid，there was a decrosslinking reaction and the crosslinked boron was released.