The invention relates to a barrel, in particular a barrel machining device. The barrel machining device is simple in structure and convenient to operate, and the work efficiency and machining qualityare improved. The barrel machining device comprises a rotating table, a supporting column, a base, a transfer mechanism, an edge pressing assembly and multiple lifting convex dies. The supporting column is connected to the centers of the rotating table and the base. The edge pressing assembly is arranged on the bottom face of the rotating table. The multiple lifting convex dies are annularly arranged on the base, and an annular roller sleeve is movably arranged on the surface of each lifting convex die. The edge pressing assembly is located above the lifting convex dies. The transfer mechanismis arranged on one side of the base and used for barrel transferring. The transfer mechanism comprises a pedestal, a rotating frame and a suction cup. The suction cup is arranged on the rotating frame, and the rotating frame is arranged on the pedestal. A movably-connected lantern ring is arranged on the supporting column, and a flexible pull rod is arranged on the lantern ring and is connected with the rotating table through a vertical rod. According to the barrel machining device, the machining quality is guaranteed, and operation is reliable.