The present invention provides an antenna automatic adjusting device which comprises a first box body, a second box body, a first driving device, a second driving device and an antenna mounting plate. The first box body and the second box body are connected through a first connection member. The second box body and the antenna mounting plate are connected through a second connection member. The first driving device is arranged in the cavity of the first box body. The second driving device is arranged in the cavity of the second box body. The first driving device drives the first box body to move parallel to a first plane with the first connection member as a center of a circle. The second driving device drives the antenna mounting plate to move along the direction perpendicular to the first plane with the second connection member as a center of a circle. Thus the antenna mounting plate is rotated along the direction and is perpendicular to the first direction, and the antenna arranged on the antenna mounting plate can be precisely adjusted.