The invention discloses a low-noise steel sheet film covering mechanism. The mechanism comprises a rack on which an uncoiling roller set and a film covering device are arranged, wherein the uncoiling roller set comprises a charging roller and an uncoiling assisting roller; the film covering device comprises a tensioning roller, a steel sheet conveyor belt and a compressing roller; an assisting roller adjusting device is also arranged on the rack and movably connected to the end part of the uncoiling assisting roller; the assisting roller adjusting device is used for continuously guiding the uncoiling assisting roller to close to the feeding roller. According to the low-noise steel sheet film covering mechanism, the uncoiling assisting roller and the assisting roller adjusting device are additionally arranged; the uncoiling assisting roller is driven by the assisting roller adjusting device to close to the surface of a coiled material; a protecting film forwards moves around the uncoiling assisting roller once being separated from the coiled material, namely, the separating angle between the protecting film and the coil material is increased, and thus the adhering between the protecting film and the coiling material is reduced; moreover, the vibration in separating of the protecting film and the coiling material can be reduced through the uncoiling assisting roller.