Light guide plate and forming mould thereof, and backlight module

A forming mould for manufacturing a light guide plate, wherein the light guide plate comprises a transparent substrate and a light shielding member, the transparent substrate comprises a light outgoing surface, a bottom surface opposite to the light outgoing surface, a light incoming side and a non-light incoming side, and the light shielding member is integrally connected with the non-light incoming side of the transparent substrate, and

• the forming mould comprises a moving half, a fixed half and a pivoted axle, wherein the moving half is slidably mounted on the fixed half via the pivoted axle and is rotatable along a circumferential direction of the pivoted axle, a first mould cavity and a second mould cavity are set on the moving half, a bump is set on the fixed half, and the bump is set to correspond to the first mould cavity and the second mould cavity so as to form a third mould cavity for injection-moulding the light shielding member.