Sample adding arm operation detection method and device

The invention discloses a sample adding arm operation detection method and device, and the method comprises the steps: carrying out the downward detection of a liquid level by a sample adding needle for multiple times under the same sample adding condition, reading the downward pulse of each time, calculating an average value, a maximum value and a minimum value from the read pulses and obtaining a threshold range through calculation. When a biochemical analyzer operates, the sample adding needle can obtain a difference value between the downward detection stroke this time and the downward detection stroke last time for liquid in the same test tube, and if the difference value between the two times is not within a threshold value range, a prompt is given that sample adding is too deep or too shallow. The technical problems of too deep sample adding, shaking of the sample adding arm and the like caused by abnormal sensitivity of the sensor of the sample adding arm and too shallow sample adding caused by trigge