Connecting structure of fan outer cover and fan

The utility model discloses a fan outer cover connecting structure and fan, the fan outer cover comprises a front cover and a rear cover, the front end face of the rear cover is provided with an extension ring extending forwards into the front cover, the outer wall of the extension ring is uniformly provided with a plurality of convex pieces along the circumference, and the convex pieces are connected with the front cover. A plurality of protruding pieces are arranged on the inner wall of the front cover, a plurality of U-shaped rings corresponding to the protruding pieces are evenly distributed on the inner wall of the front cover along the circumference of the inner wall of the front cover, a guiding inclined rod is arranged on the lower portion of one side of an opening of each U-shaped ring, a bayonet is formed between the upper portion of each inclined rod and the upper portion of the corresponding U-shaped ring, and the protruding pieces are clamped in the U-shaped rings to be fixed. During connection,