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The application provides a pre-stress insulator porcelain piece and a preparation method thereof, and belongs to the technical field of power equipment. The pre-stress insulator porcelain piece comprises the following components in percentage by weight: calcined industrial alumina 15-30%, quartz powder 5-15%, potassium feldspar 12-25%, and clay 30-60%. The pre-stress insulator porcelain piece has a density gradient in the inner and outer layers of the blank, which can essentially offset the tensile stress of the whole porcelain piece caused by the isostatic pressing and extrusion process, has excellent mechanical properties, and has important significance for meeting the demand of increasing the voltage grade of power transmission and transformation lines.