A support device includes a supporting main body, a first angle rotation unit, a second angle rotation unit, a height adjustment structure, an absorbing unit and a driver motor unit. The absorbing unit is pivotally connected to the first angle rotation unit. The driver motor unit includes a first driving element, a second driving element and a third driving element. The first driving element drives the first angle rotation unit to adjust a rotation angle of the absorbing unit. The second driving element drives the second angle rotation unit for enabling the supporting main body to rotate around an axial thereof. The third driving element drives the height adjustment structure for enabling the supporting main body to move along the axial thereof. In addition, an support unit system and a support unit control system are also provided.