The invention discloses a petroleum casing collar automatic production line. The petroleum casing collar automatic production line comprises a long casing conveying device, a long casing cutting device, a marking device, a collar blank conveying device, a lifting device, a mechanical hand structure, a machining device and other multiple process devices; and the long casting cutting device, the marking device, the collar blank conveying device and the lifting device are connected through connection conveying plates. According to the petroleum casing collar automatic production line provided bythe invention, the mechanical devices cooperates with electrical control, the process that taking and conveying of a long casting, turning of the end surface and the outer circle of the long casting,cutting off of the long casing, marking of a collar blank, conveying of the collar blank between planes different in height, mechanical hand grabbing and machine tool machining are automatically and efficiently conducted is achieved, manpower is saved, and the production efficiency is improved.