A fully automatic steel pipe chamfering machine comprises a base (22). A large carrier plate (21) is mounted on the base (22), and is provided with a hook plate (17) respectively on two sides, the hook plates hooking tightly to the base. The large carrier plate is mounted with a base housing (7) by means of a sliding rail, and a headstock (8) is mounted on the base housing by means of a fastener. The headstock has a modular structure including an upper headstock member (801) and a lower headstock member (802), the lower headstock member is connected to the base housing, the upper headstock member is mounted on the lower headstock member, and a gear transmission mechanism is mounted in the lower headstock member. A primary motor (5) is mounted above the base housing at the lower portion of the headstock, an output end of the primary motor is connected to the gear transmission mechanism in the headstock by means of a first coupling (6). A cutter disk (10) is mounted on an outer side of the headstock, and a cutting device (11) is mounted on the cutter disk. A holder device (13) is further mounted at one end of the large carrier plate, a first drag chain (31) is mounted at one end of the large carrier plate, and a second drag chain (32) is mounted at a top portion of the first drag chain by means of a holder plate. The fully automatic steel pipe chamfering machine has a high level of automation, superior machining capability, and excellent safety and reliability.
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