Surface flattening equipment for production of multi-layer composite copper foil

The invention belongs to the technical field of copper foil production, and particularly relates to surface flattening equipment for multi-layer composite copper foil production, which comprises a support assembly, at least three layers of metal materials are conveyed at the feeding end of the support assembly, and the feeding end of the support assembly is connected with a first cleaning mechanism for cleaning the metal materials. The middle end of the support assembly is connected with a guide mechanism for guiding metal materials, and the discharging end of the support assembly is connected with a flattening mechanism. The guide mechanism comprises a first guide unit close to the first cleaning mechanism and a second guide unit close to the flattening mechanism, the second guide unit is used for primarily laminating the metal material, and the first guide unit and the second guide unit are respectively connected with a second cleaning mechanism; the flattening mechanism comprises a negative pressure unit u