Cooling device, evaporation equipment, current collector and battery monomer

The utility model discloses a cooling device, evaporation equipment, a current collector and a battery monomer. The cooling device is used for cooling the film layer and comprises a roller and a magnetic assembly. A containing cavity is formed in the roller, and the roller is provided with a cooling flow path used for circulation of a cooling medium. The magnetic assembly is arranged in the containing cavity and generates a magnetic attraction effect on the film layer, and the magnetic assembly comprises a plurality of magnetic parts which are independently arranged. By means of the magnetic attraction effect, the film layer can be better attached to the peripheral wall of the roller, the cooling effect of the cooling device on the film layer is improved, the possibility of deformation of the film layer in the film coating process is reduced, the defects of scalding, holes and the like caused by local overheating or insufficient heat dissipation of the film layer are reduced, and the service life of the film layer is prolonged. Furthermore, the performance of a product with the film layer can be improved.