Graphite disc

The embodiment of the invention discloses a graphite disc. The graphite disc comprises a first graphite disc and at least one second graphite disc, wherein the first graphite disc is provided with atleast one groove for containing the second graphite disc; a spiral type ventilation rail groove is formed in the bottom of the groove; a supporting column for fixing the second graphite disc is further arranged at the center of the bottom of the groove; a fixing groove which is matched with the supporting column is formed in the center of the bottom of the second graphite disc; the second graphitedisc is fixed on the supporting column of the groove of the first graphite disc through the fixing groove; the second graphite disc comprises a sheet groove and a sheet groove retaining wall; the sheet groove retaining wall is provided with a plurality of groove structures; a space is formed between each two adjacent groove structures. According to the graphite disc provided by the embodiment ofthe invention, the uniformi