An embodiment of the invention provides a magnetic partition, an evaporation cavity and an evaporation device, relates to the technical field of evaporation, and can solve the problems that magnetic attraction forces of the magnetic partition in the prior art to various parts of a mask are uneven, and the magnetic attraction effect is poor. The magnetic partition comprises a bottom plate and a plurality of strip-shaped magnet groups, wherein the strip-shaped magnet groups are arranged on the bottom plate, are arranged side by side and are parallel to one another; each strip-shaped magnetic group comprises a plurality of strip-shaped magnets; the strip-shaped magnets are arranged at intervals in the direction perpendicular to the length directions of the strip-shaped magnets; and polar directions of the strip-shaped magnets are the same. The ability of attraction of the magnetic partition to a mask and a to-be-evaporated substrate arranged between the magnetic partition and the mask isimproved, the effect of attraction of the magnetic partition to the mask and various positions of the to-be-evaporated substrate is balanced, and the evaporation effect of the to-be-evaporated substrate is improved.