The invention discloses a light guide plate and a mould for manufacturing the light guide plate, and relates to the light guiding technology. The light guide plate comprises a light emitting surface and a bottom surface opposite to the light emitting surface, wherein the light emitting surface or the bottom surface is provided with spaced grooves, and the spaced grooves are arranged to be in a linear mode through multiple spaced secondary channels. According to the mould for manufacturing the light guide plate, spaced grooves matched with the spaced grooves of the light guide plate are manufactured in a mould core of the mould. As the spaced grooves of the light guide plate are formed by arranging the multiple spaced secondary grooves, the mould core of the mould can be manufactured and machined conveniently, the mould core can be machined not by special tools but by a striking machine with a striking head, the machining difficulty is reduced largely, cost of the machining the mould is lowered greatly, and the manufacturing cost of the light guide plate is greatly lowered correspondingly. The light guide plate still keeps the basic optical performance of a continuous groove, the light emitting brightness of the light guide plate can reach above 90% that of a light guide plate with the continuous V-type groove, and the use requirement can be met.