Vacuum blood collection tube automatic puncture device capable of automatically sensing liquid level

The invention discloses a vacuum blood collection tube automatic puncture device capable of automatically sensing a liquid level, which comprises a test tube rack, a vacuum blood collection tube is sleeved on the inner surface of the test tube rack, the test tube rack is assembled on the upper surface of a detection equipment bracket, and a lifting type vacuum blood collection tube top puncture device is assembled on the side surface of the test tube rack. The rear end of the test tube rack is provided with a sample collection device which realizes sampling and cleaning through rotation and is used for collecting blood samples. The device is provided with a liquid level sensing device and an automatic puncture pipe cap device, and a pipe cap puncture needle and a sample needle are separately designed. After the automatic puncture needle punctures through the tube cap, when the sample needle begins to probe down to the surface of a blood sample in the tube, automatic induction can be realized, the sample needl