A magnesium oxide whisker in-situ synthesis spinel-reinforced magnesium oxide-based crucible that may perform sintering at a low temperature and that has excellent chemical stability and thermal shock resistance, and a preparation method therefor, the preparation method comprising the following steps: (1) according to mass percentage, mixing 15%-25% of nano alumina sol and 0.8%-1.5% of a rheological agent, the rest being magnesium oxide ceramic powder containing a nano titanium dioxide sintering aid, adding anhydrous ethanol, mixing evenly by means of ball milling, and then preparing a ceramic slurry having a solid content of 65%-75%; (2) preparing a crucible biscuit; (3) preparing a crucible blank; (4) placing the magnesium oxide-based crucible blank in alumina sol for vacuum impregnation treatment, then performing surface finishing treatment, drying, then performing high-temperature secondary sintering at a temperature of 1350°C-1550°C, and cooling to room temperature in the furnace to obtain a magnesium oxide-based crucible.
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