The invention discloses an electron transport layer material preparation method and a QLED device. The method comprises the following steps: fullerene is prepared by a catalytic alkali method to obtain fullerenol, and a fullerenol solution is prepared; and the fullerenol solution and a metal oxide nanoparticle solution are mixed to prepare the electron transport layer material. The fullerene material is alcoholized and is mixed and doped with the metal oxide nanoparticles of the existing electron transport layer to together serve as the electron transport layer; and through adjusting the concentrations and the types of various materials, material selection of the electron transport layer is greatly enriched, the charge mobility of the electron transport layer can also be effectively adjusted, and the performance of the QLED device is further effectively improved.