The invention discloses alumina ceramic applied to a J-R type electrostatic chuck and a preparation method of the alumina ceramic and belongs to the field of semiconductor materials. The alumina ceramic material is prepared from components in percentage by weight as follows: 82%-88% of alpha-alumina, 7%-10% of titanium dioxide, 0.5%-2% of magnesium oxide and 2%-5.5% of silicon dioxide. A tape casting technology is adopted in the preparation method of the alumina ceramic, and the obtained alumina ceramic material has the volume resistivity controlled in the range of 10<9>-10<11> omega.cm in thevoltage range of 100-1,000 V and can be used as an ideal dielectric material of the J-R type electrostatic chuck.