With the development of the Internet and artificial intelligence, the intelligent packaging industry in specific application scenarios will usher in a new tuyere. Among them, the application of electroluminescent devices in the field of intelligent packaging has attracted much attention. This paper aims to prepare ITO-based multi-layer composite electroluminescent labels by screen printing, and explore the structure, surface morphology and optical properties of the label film at different annealing temperatures through atomic force microscopy and luminance meter. The results show that under the same driving conditions (110 V 400 Hz) and annealing time (30 min), when the annealing temperature is adjusted from 60 ℃ to 180 ℃, the surface roughness of the film is the lowest at 120 ℃, the luminescent luminance of the label film is the highest (93 cd/cm2), and the optical loss is the smallest, providing a reference for the preparation of high-performance EL devices.