The invention provides an electroluminescent display screen and a method for preparing the same, and a display device, by which an electroluminescent display screen can automatically screen the irradiation of a laser, so that a mask can be omitted, the requirement on the manufacture process can be lowered, the production cost can be reduced, and the production capacity can be increased. An electroluminescent display screen according to the invention includes: a back plane; a package substrate; and a luminescent layer and a frit sealant provided between the back plane and the package substrate. The electroluminescent display screen further comprises a light-shielding pattern layer for shielding the region other than the frit sealant when a laser irradiates on the frit sealant, which is formed on one side of the package substrate that faces the back plane.