The invention belongs to the technical field of refractory materials, and provides a preparation method of a compact chromium oxide product with high thermal shock resistance. According to the preparation method of the compact chromium oxide product with the high thermal shock resistance, the raw material of the chromium oxide product is composite chromium oxide micro-powder with the particle size of less than or equal to 45mu m; the composite chromium oxide micro-powder is prepared from chromium oxide micro-powder, titanium oxide micro-powder and a bonding agent. The preparation method comprises the steps of adding metal Zr micro-powder into the composite chromium oxide micro-powder; homogenizing and granulating the composite chromium oxide micro-powder to obtain a chromium oxide green body; replenishing an electric furnace, which contains the chromium oxide green body, with high-purity inert gas Ar; when the temperature is 1450-1650 DEG C, carrying out heat preservation for 2-8h, and sintering to obtain the compact chromium oxide product which is high in thermal shock resistance and has the chromium oxide content of more than 86%. The preparation method of the compact chromium oxide product with the high thermal shock resistance solves the problems that the compact chromium oxide product is great in density gradient difference of an inside body and an outside body, poor in thermal shock resistance, and the like, guarantees the uniformity of an internal structure of the compact chromium oxide product, and improves the sintering properties and use performance of large compact chromium products.