The invention discloses a device for polishing and repeatedly coating refractory materials on an old steel beam, which comprises a main machine body, wherein a working cavity with a left opening and a right opening is formed in the main machine body, a structural steel beam can penetrate through the working cavity, the structural steel beam is provided with two structural grooves which are symmetrical front and back, a rear motor cavity is formed in the main machine body, a motor is fixedly installed on the bottom wall of the motor cavity, the main machine body is controlled to move leftwards on the top surface of the structural steel beam when the motor rotates forwards, and the main machine body can automatically move on the top surface of the structural steel beam by sleeving the structural steel beam when the motor stops rotating.
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