A backlight module and a liquid crystal display are disclosed. The backlight module includes a back frame and a support. The back frame is arranged on the support and is fixedly connected with the support. A receiving cavity is formed between the back frame and the support for receiving flexible circuit boards and printed circuit boards connecting to the flexible circuit boards. By adding the support at the outer side of the back frame, the receiving cavity is formed between the back frame and the support to receive the doubled flexible circuit boards and printed circuit boards. Not only the resolution of the liquid crystal display is achieved, but also the reliability of the mechanical components of the liquid crystal display is enhanced.