An electrode sheet turning mechanism includes a housing, a conveyor belt, a driver, and a stripper. The housing has a suction cavity, and forms an arc-shaped guide surface. A material feeding region and a material discharging region are formed on the arc-shaped guide surface, which is further provided with first suction holes. Second suction holes run through the conveyor belt. The conveyor belt is wound on the arc-shaped guide surface, and seals the first suction holes. The driver is for driving the conveyor belt to move. The stripper is for extending to the position between the conveyor belt and the electrode sheet. In the present utility model, the electrode sheet can be automatically turned.