The invention discloses high-temperature sintered painted sand and a preparation method thereof. The painted sand comprises silicate mineral particles and a surface toner layer, wherein the surface toner layer is formed by calcining color paste wrapping the surface of the silicate mineral particles at high temperature. The preparation method comprises the following steps: selecting and screening the silicate mineral particles; preparing the color paste, namely mixing water glass, kaolin, industrial borax and inorganic pigment with water according to the required color situation, and performing ball-milling; mixing the prepared color paste with the silicate mineral particles according to a weight ratio in a rotary drum furnace, and drying; after mixing and drying through the rotary drum furnace, calcining at high temperature, and after the calcining process is finished, feeding to the outlet of a calcining furnace; cooling and storing, namely cooling finally to prepare the high-temperature sintered painted sand. According to the preparation method, the operation is easy, the continuous production can be performed, the color adjustment of the painted sand is easy to control, the color consistency control of the painted sand can be ensured, the production is simple and quick, the cumbersome process in which frits need to be used is removed by optimization, the energy consumption is reduced, and the large-scale application is facilitated.