A light source module and an electronic device are provided. The light source module includes a light guiding plate, at least one light-emitting element and a quantum dot element. The light guiding plate has a light incident surface and a light emitting surface. The at least one light-emitting element is disposed on the light incident surface to provide a first light beam, and includes yttrium aluminum garnet (YAG). The quantum dot element is disposed on the light emitting surface of the light guiding plate, and is configured to transfer part of the first light into a first monochromatic light. White light can be obtained by mixing by the first light and the first monochromatic light.