The invention discloses a multi-unit multi-layer mask folding mechanism. The multi-unit multi-layer mask folding mechanism includes multiple turnover devices arranged side by side and further includesclamp welding devices which correspond to the turnover devices respectively; cutting tools are arranged between the turnover devices and the clamp welding devices, each cutting tool includes an upperblade and a lower blade. The multi-unit multi-layer mask folding mechanism is simple in structure, through a simple bent rod and cooperation of other structures, the purpose of turning over cloth upand down is achieved, and when the cloth is turned over, particulate matter can be sprinkled into the cloth to manufacture multi-layer masks.