The present invention provides a direct light backlight module with solar light assistance, which comprises a backboard. The backboard is provided with a waveguide. A light source is disposed under the waveguide. An optical film module is disposed above the waveguide and faces the light emitted from the direct light source. An assisting light source device is provided and which collects solar light and direct it to an optical film module. The present invention further provides a liquid crystal display device with the direct light backlight module with assisting solar light. With the provision of the assisting light source, the solar light can be used as an assisting light source making the backlight module and the liquid crystal display device made therefrom become more environmental friendly.