Liquid amount control device and liquid amount control method thereof

A liquid amount control device for controlling liquid amount of liquid in a test tube, and the liquid amount control device comprises:

• a position detector;
• a pump connected with a first tip and configured to suck up the liquid out of the test tube;
• a driver connected with the pump and configured to drive the pump to move;
• a controller, electrically connected to the position detector, the driver and the pump, and the controller is configured to:
• control the driver to drive a first suction end of the first tip to enter a detection region of the position detector to obtain an end height position of the first suction end;
• control the driver to drive the first suction end of the first tip to enter the liquid by a first entering depth according to the end height position;
• and
• control the pump to suck up the liquid in the test tube through the first tip.