The invention discloses a machining device for columnar curved toughened glass. The device mainly comprises a glass heating furnace, a glass bend forming mechanism and a glass cooling and toughening mechanism which are connected in sequence, wherein the glass bend forming mechanism is used for performing bend forming on carried glass by changing planar arrangement of each supporting roll in a roll table for carrying the high-temperature sheet glass into curved arrangement corresponding to the glass shape to be formed in space; and a conveying roller for outputting the formed curved glass along the axis of the supporting roll is arranged in a roll table gap of the forming mechanism. According to the machining device, the bend forming and the cooling and toughening of the high-temperature sheet glass are separately finished by two stations, so that the routine that the conventional bend forming and the cooling and toughening are integrated on a forming device is broken, and a new technical approach is provided for machining of the columnar curved toughened glass.