Disclosed is an optical plate which comprises at least one optical plate unit, each optical plate unit includes a first surface and a second surface relative to the first surface. The first surface is provided with a plurality of conical micro-bulges, the second surface is provided with a plurality of spherical grooves, and at least one of the first surface and the second surface is equipped withat least one light source containing part. Each conical micro-bulge is a stacked cone frustum bulge with taper decreasing from up to bottom in sequence. The invention also provides a backlight module group adopting the optical plate. The backlight module group has the advantage of uniform light exit.