A bag making machine is mainly composed of a storage device, a stepping device, a frequency conversion device, a whole bag device, a heat sealing cutter and a control device. The main feature is that the storage device stores a corresponding amount of raw materials, the stepping device drives the raw materials, the frequency conversion device drives the heat sealing cutter, the whole bag device is in the whole bag after the number of fixed bags is produced, and the heat sealing cutter controls the temperature through the temperature controller to control the raw materials. Sealing and cutting, the control device coordinates all aspects of the action.