An air deflector assembly, configured to be disposed at an air outlet of an air conditioner, comprising: a first air deflector, which is rotatably arranged and configured to guide outlet airflow of the air conditioner to sweep up and down; characterized in that said air deflector assembly further comprises: a second air deflector, which is configured to be disposed at a top of the air outlet of the air conditioner and above the first air deflector, and further configured to guide the outlet airflow to flow only towards the ground; the second air deflector and the first air deflector are juxtaposed, wherein the second air deflector is rotatably arranged and configured to rotate only towards the ground; a top position limiting device is arranged on a surface of the second air deflector, which faces opposite to the ground; wherein the top position limiting device is configured to prevent the second air deflector from rotating in a direction away from the ground; a connecting device is provided between the first air deflector and the second air deflector; wherein the first air deflector is further configured to drive the second air deflector to rotate in the direction toward the ground simultaneously when it rotates in a direction toward the ground. a first air deflector, which is rotatably arranged and configured to guide outlet airflow of the air conditioner to sweep up and down; characterized in that said air deflector assembly further comprises: a second air deflector, which is configured to be disposed at a top of the air outlet of the air conditioner and above the first air deflector, and further configured to guide the outlet airflow to flow only towards the ground; the second air deflector and the first air deflector are juxtaposed, wherein the second air deflector is rotatably arranged and configured to rotate only towards the ground; a top position limiting device is arranged on a surface of the second air deflector, which faces opposite to the ground; wherein the top position limiting device is configured to prevent the second air deflector from rotating in a direction away from the ground; a connecting device is provided between the first air deflector and the second air deflector; wherein the first air deflector is further configured to drive the second air deflector to rotate in the direction toward the ground simultaneously when it rotates in a direction toward the ground. a second air deflector, which is configured to be disposed at a top of the air outlet of the air conditioner and above the first air deflector, and further configured to guide the outlet airflow to flow only towards the ground; the second air deflector and the first air deflector are juxtaposed, wherein the second air deflector is rotatably arranged and configured to rotate only towards the ground; a top position limiting device is arranged on a surface of the second air deflector, which faces opposite to the ground; wherein the top position limiting device is configured to prevent the second air deflector from rotating in a direction away from the ground; a connecting device is provided between the first air deflector and the second air deflector; wherein the first air deflector is further configured to drive the second air deflector to rotate in the direction toward the ground simultaneously when it rotates in a direction toward the ground.