Coated white cardboard and production process thereof

The coated white cardboard comprises a surface layer, a core layer and a bottom layer, the surface layer is sequentially coated with a first surface coating, a second surface coating and a third surface coating from inside to outside, and the outer surface of the bottom layer is coated with a bottom coating; the first surface coating comprises calcium carbonate, coating starch, pre-coating latex, biological latex, a modified rosin tackifying emulsion, a waterborne epoxy emulsion, a dispersing agent, a lubricating agent, CMC, a pre-coating water repellent agent, a whitening agent and product violet; the third surface coating comprises china clay, calcium carbonate, surface coating latex, waterborne polyurethane emulsion, a dispersing agent, a lubricating agent, CMC, a surface coating water repellent agent, a coupling agent, a whitening agent, product violet and a defoaming agent. The white cardboard disclosed by the invention has obvious advantages in the aspects of surface strength, surface roughness, ink abs