Sample extraction chip and biological reaction device

A sample extraction chip, comprising:

• a chip body;
• and
• a sample extraction module provided on the chip body;
• wherein the sample extraction module comprises a sample-loading lysis unit, a liquid release-control unit, an extraction unit, a liquid switch-control unit, a liquid collection unit and a sample collection unit, which are connected through flow channels in a sequence of extraction;
• the liquid release-control unit is configured to store and release liquid reagents, and the liquid switch-control unit is configured to switch between communication of the liquid collection unit and the extraction unit as well as communication of the sample collection unit and the extraction unit;
• and
• the sample collection unit comprises a front collection portion and a rear collection portion which are both in communication with the liquid switch-control unit, the front collection portion and the rear collection portion are sequentially distributed along a rotation direction of the chip body, samples flow into the front collection portion first, and then into the rear collection portion, and at least one of the rear collection portion is provided with a sampling port.