The invention discloses a man-made stone basin and a preparation method thereof. The man-made stone basin comprises a main material, a filter and auxiliary materials, wherein the main material comprises the following ingredients in parts by weight: 80-98 parts of unsaturated polyester resin; the filter comprises the component in parts by weight: 1-10 parts of limestone powder; and the auxiliary materials comprise any multiple substances or all the substances in the following components in parts by weight: 0.1-1 part of accelerant, 0.1-1 part of curing initiator, 0.1-1 part of fire retardant, 0.1-1 part of coupling agent, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizer, 0.1-1 part of color paste and 0.1-1 part of flashlight powder. The preparation method mainly comprises the steps of: mixing the base material, the filler and the auxiliary materials; filling slurry into the mixture; curing and molding; demoulding; carrying out post-curing treatment; and polishing and waxing. The man-made stone basin is free from warping and cracking, smooth in surface, free from bubbles and pitted surface, good in hardness and gloss maintenance, oxidation-resistant, aging-resistant, free from pollution, rich in colors, fashionable and attractive.