The invention relates to a silicon carbide ceramic and a low temperature sintering method thereof. The silicon carbide ceramics is prepared by mixing 75-85 parts by weight of silicon carbide with 15-25 parts of a sintering aid, ball-milling, drying, carrying out dry pressing molding and carrying out liquid phase sintering, and the sintering aid comprises 14.5-23 parts of elemental aluminum, 0.2-1 part of boron carbide and 0.3-1 part of carbon. The low temperature sintering method of the silicon carbide ceramic comprises the following steps: putting silicon carbide and the sintering aid in a ball milling barrel, adding deionized water, an aqueous solution of polyvinyl alcohol and water-soluble resin, ball-milling, drying, screening, adding the obtained screened mixture into a steel die, carrying out compression molding, and carrying out liquid phase sintering at a temperature of 1800-1900 DEG C to obtain the final product silicon carbide ceramic. The addition of the sintering aid obtained through the reasonable compatibility of elemental aluminum, boron carbide and carbon reduces the sintering temperature and can obtain the highly compact silicon carbide ceramic.