An air guide structure, wherein comprising: an air delivery passage, wherein an end part of the air delivery passage is formed into an air outlet; the air delivery passage comprises a first wall and a second wall that are provided oppositely; an air guide plate is provided below the air outlet and is positioned between the first wall and the second wall; the air guide plate is extended along a forward direction and a backward direction; a height of an upper edge of the air guide plate is not greater than a height of a lower edge of the air outlet; the air delivery passage is obliquely extended upward and forward; the first wall is provided at a lower side, and the second wall is provided at an upper side; characterised in that the first wall is formed by a first horn structure which is hollow overall and whose outer diameter is gradually increasing from a lower end to an upper end; the second wall is formed by a second horn structure which is hollow overall and whose outer diameter is gradually increasing from a lower end to an upper end; the second horn structure is provided at a periphery of the first horn structure from below in a sleeving manner; an upper edge of the first horn structure and an upper edge of the second horn structure are respectively formed into the lower edge and an upper edge of the air outlet; the air guide plate is provided on a radial outer sidewall at a front side of the first horn structure and/or on a radial inner sidewall at a front side of the second horn structure; wherein the upper edge of the first horn structure and the upper edge of the second horn structure are obliquely provided in a same direction relative to a horizontal direction; and wherein the second horn structure comprises a first edge located at a front side and provided at a lowest position, and a second edge located at a rear side and provided at a highest position; the air guide plate is provided near the first edge of the second horn structure; the height of the upper edge of the air guide plate is not greater than that of the first edge of the second horn structure. the air delivery passage is obliquely extended upward and forward; the first wall is provided at a lower side, and the second wall is provided at an upper side; characterised in that the first wall is formed by a first horn structure which is hollow overall and whose outer diameter is gradually increasing from a lower end to an upper end; the second wall is formed by a second horn structure which is hollow overall and whose outer diameter is gradually increasing from a lower end to an upper end; the second horn structure is provided at a periphery of the first horn structure from below in a sleeving manner; an upper edge of the first horn structure and an upper edge of the second horn structure are respectively formed into the lower edge and an upper edge of the air outlet; the air guide plate is provided on a radial outer sidewall at a front side of the first horn structure and/or on a radial inner sidewall at a front side of the second horn structure; wherein the upper edge of the first horn structure and the upper edge of the second horn structure are obliquely provided in a same direction relative to a horizontal direction; and wherein the second horn structure comprises a first edge located at a front side and provided at a lowest position, and a second edge located at a rear side and provided at a highest position; the air guide plate is provided near the first edge of the second horn structure; the height of the upper edge of the air guide plate is not greater than that of the first edge of the second horn structure.