The invention provides continuous modified polystyrene light guide plate production technology, and a modified polystyrene light guide plate, and belongs to the technical field of light guide plate. The continuous modified polystyrene light guide plate production technology comprises following steps: styrene monomer and methyl methacrylate monomer are subjected to binary copolymerization so as toobtain a modified polystyrene melt; the modified polystyrene melt is introduced into a sheet material moulding system through thermal insulation conveying, and is prepared into the modified polystyrene light guide plate using the sheet material moulding system. In the prior art, the polystyrene light guide plate is prepared via heating melting plasticizing of polystyrene master batch with a lightguide powder, crystal points and partially carbonized polystyrene are left on the obtained polystyrene light guide plate because of existing of unreacted materials on the polystyrene light guide plate, and technical problems in the prior art that light penetration is uniform, light transmittance is low, plate surface yellow light is generated are solved. The modified polystyrene light guide plateis uniform in light penetration, high in light transmittance, low in water absorption rate, and high in size stability; no yellow light is generated; and the image quality and sharpness of liquid crystal display devices can be ensured.