The invention belongs to the technical field of building materials, and relates to concrete, particularly to high-strength white concrete and a preparation method thereof. The technical scheme is thatthe concrete is prepared from the following components in parts by weight: 70-100 parts of white Portland cement, 10-30 parts of white mineral powder, 10-30 parts of white limestone powder, 5-15 parts of metakaolin, 5-10 parts of titanium dioxide, 100-200 parts of river sand, 120-150 parts of light-color aggregate, 35-50 parts of water, 1-3 parts of a water reducing agent, 0.2-0.5 part of a retarder, 5-10 parts of carbon quantum dots and 5-8 parts of sodium chloropalladate. According to the high-strength white concrete and the preparation method thereof provided by the invention, the carbon quantum dots and the sodium chloropalladate are added, so that the early heat release rate of the concrete is reduced, and the strength and the cracking resistance of the concrete are improved; and icenucleation is inhibited, and white concrete is prevented from being corroded and discolored after being covered by ice and snow in severe cold areas.