Light guide plate and manufacturing method thereof, front-lighting and display device

A manufacturing method of light guide plate, comprising:

• providing a light guide plate body having a first surface and a second surface opposite to each other, and a light incident surface connected between the first surface and the second surface;
• forming a plurality of optical microstructures on the first surface of the light guide plate body, wherein refractive index of the optical microstructure is greater than the refractive index of the light guide plate body;
• a bottom surface of the optical microstructure is attached to the first surface of the light guide plate body;
• and the optical microstructure is configured such that when light passes through and emits from the optical microstructure from the light guide plate body, an angle between an emergence direction of the light and a vertical line relative to the bottom surface of the optical microstructure is smaller than an incident angle of the light incident on the bottom surface of the optical microstructure.