The invention relates to a backlight system of an integral microstructure, which comprises a light guide plate, a light source and a reflector plate, wherein the light guide plate is provided with a light inlet surface, a light outlet surface and a bottom surface opposite to the light outlet surface, the light source is arranged near the light outlet surface, the reflector plate is arranged near the bottom surface, the light outlet surface of the light guide plate is equipped with a micro-optics light focusing structure, and the reflector plate is equipped with a micro-reflection structure. By means of the above structure, the reflecting surface of the micro-reflection structure of the reflector plate reflects light, a light reflecting field can be focused and modulated via changing the inclination angle of the reflecting surface, and the brightness value in an ideal vision field of the light guide plate can be further increased by engaging with the micro-optics light focusing structure of the light guide plate, thereby avoiding using traditional prism sheets, reducing the number of device elements, realizing high integration of the backlight system, increasing the optical energy usage, and reducing the cost.