The utility model discloses a vertical third cyclone separator, which solves the problem that a smoke outlet of a prior vertical third cyclone separator is difficult to arrange in the top seal head and the excess weld calculation at the connection piece of the top seal head is difficult. A shell is composed of a top seal head (1), a middle barrel and a bottom cone (13), wherein the middle barrel is composed of an upper barrel (2), a connection cone segment (7) and a lower barrel (10) and the inner diameter of the upper barrel (2) is less than the inner diameter of the lower barrel (10). A fume outlet pipe (4) is connected with a side wall of the upper barrel (2). The vertical third cyclone separator is mainly used for a regeneration gas energy recovery system in a petroleum refining and coalification industry fluidization reaction regeneration device and effectively separates catalyst granules or dust from the regeneration fume.