The invention relates to an inorganic environment-friendly manmade art stone and a preparation method thereof. The inorganic environment-friendly manmade art stone is prepared from the following raw materials in parts by mass according to a proportional ratio: 55 to 70 parts of quartz sand particles, 4 to 9 parts of quartz sand powder, 17 to 24 parts of cement, 1 to 4 parts of activity additive, 1to 2 parts of expander, 0.3 to 0.4 part of water reducing agent, 3 to 5 parts of emulsion, 0.05 to 0.1 part of water retention agent, and 3 to 5 parts of water. The inorganic environment-friendly manmade art stone has the advantages that by adding the inorganic activity additive, the condition of common alkaline return of the cement type base plate is avoided; by adopting the expander, the self-shrinkage of the cement type base plate is effectively compensated, and the cracking of a forming plate is reduced; the preparation method is simple, the production technology conditions are easy to control, the product quality is stable, and the production cost is low.