The invention relates to a preparation method of a slim mirror-plane artistic porcelain painting which consists of a preform body and glazes, wherein the preform body is prepared from the following components in percentage by weight: 15-20% of soft soil, 5-10% of hard soil, 30-40% of porcelain stones, 10-15% of tremolite, 15-20% of pyrophyllite and 15-20% of albite; the bottom glaze is prepared from the following components in percentage by weight: 55-65% of frit I, 10-15% of frit II, 1-2% of aluminum oxide, 3-5% of calcined kaolin and 15-25% of kaolin. The preparation method comprises the following steps: preparing the preform body and the glazes, roll-pressing and molding the preform body, drying, biscuiting, applying bottom glaze, applying surface glaze, performing colored drawing, and performing high-temperature glaze firing to obtain the slim mirror-plane artistic porcelain painting. By combining the latest international ceramic ink-jet printing technology with the conventional hand painting process of Jingdezhen, the famous scripts and paintings at all times and in all over the world are manufactured into 3D artistic porcelain paintings which are exquisite in product quality, rich in frame and fine in texture, can be widely applied to the decoration of airplanes, stations, homes and office buildings, and have wide application prospect.