The present invention provides a direct backlight module, which includes: a backplane (2), a plurality of backlight sources (4) mounted in the backplane (2), and a diffusion board (8) mounted on the backplane (2) and located above the backlight sources (4). The backplane (2) includes a bottom board (20) and a plurality of side boards (22) perpendicularly connected to the bottom board (20). The bottom board (20) includes a plurality of detachable carrier plates (24). The backlight sources (4) are mounted on the carrier plates (24). The direct backlight module of the present invention includes a plurality of carrier plates pieced together to form a bottom board of a backplane so that in assembling the backlight module, it is possible to simultaneously mount backlight sources to the plurality of carrier plates to thereby enhance the assembling efficiency. Further, when the backlight sources of some of the carrier plates are damaged, it only needs to re-work on the individual carrier plates of which the backlight sources are damaged so as to enhance the re-working efficiency.