The utility model discloses a convenient tube coupling, which comprises a main tube, the main tube is provided with a slotted hole, and an eccentric locking mechanism which passes through the slotted hole is arranged on the outer wall of the main tube. Since the eccentric locking mechanism is arranged on the main tube, locking or unlocking can be carried out as long as a handle is lifted and loosened, so the convenient tube coupling is easy to operate; and because the operating principle of the 'eccentric locking' of an eccentric wheel is adopted, the further an air tube is drawn outwards, the tighter the eccentric wheel presses the air tube, so connection is firm.