The utility model discloses an air exhausting disc which comprises a base, an air exhausting mechanism and a non-return mechanism, wherein the base consists of an upper surface, a lower surface, an air guide channel unit and an air outlet unit, wherein the air guide channel unit is formed by sinking the upper surface; the air guide channel unit comprises a central groove and a plurality of radiation channels; the air outlet unit comprises a plurality of air outlet holes which are formed in the central groove; the air exhausting mechanism comprises an air exhausting sheet and a ring-shaped cover; the non-return mechanism is connected to the base; the non-return mechanism comprises a connection unit and a one-way stop unit; the connection unit comprises a hollow pipe part which is connected to an air conveying pipe; a channel is defined by the hollow pipe part and communicated with the air outlet holes so as to form an air outlet channel; the one-way stop unit is arranged in the air outlet channel in a floating mode and used for opening the air outlet channel when the air conveying pipe is aerated and sealing the air outlet channel when the air conveying pipe is not aerated.