The utility model discloses a radiant tube cleaning device, which comprises a hand rod (1) and a brush (2), the hand rod is composed of a rod body and an internal thread joint, and one end of the rod body is welded integrally with the joint; the brush is composed of an external thread joint, a brush body and metal wires, the brush body is composed of a rod, a tube body, disks and a lock nut, an external thread joint is arranged at one end of the rod, the tube body is sleeved and integrated with the other end of the rod, external threads are formed on the two ends of the tube body so that the two ends can be locked through the lock nut, a plurality of disks are sleeved on the tube body, a plurality of holes are formed on the disks, the metal wires are bound through a hoop after penetrating the holes on the disks, a plurality of disks are laminated as a whole and locked through the lock nut; and the external thread joint of the brush is integrated with the internal thread joint of the hand rod through threaded connection. Two apertures are formed at one end of a sleeve pipe (3), and ropes penetrate through the apertures and are fixed in the apertures. The radiant tube cleaning device has the characteristics of simple structure, simplicity in operation, low cost, high cleaning efficiency and good effect.