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The bag breaking device comprises a supporting frame, one side of the supporting frame is fixedly connected with a motor, the output end of the motor is connected with a reduction gearbox, and an output shaft of the reduction gearbox is connected with a rotating shaft assembly through a coupler; the other side of the supporting frame is fixedly connected with a funnel body, the rotating shaft assembly penetrates through the funnel body and is connected with the funnel body, and a plurality of blade assemblies are arranged on the rotating shaft assembly and located on the upper portion in the funnel body. The bag breaking method comprises the steps that the bulk material ton bag is hoisted to the position above the blade assembly, the blade assembly rotates to cut the ton bag, and bag breaking is completed. The problems that in the prior art, when bag breaking is conducted, operators need to shake ton bags manually, and the labor intensity is large are solved.