Compressed air micro-fluidic blood cell separation chip

The utility model provides a compressed air type microfluidic blood cell separation chip which is used for being connected with a centrifugal machine and separating blood cells and serum in whole blood and comprises a chip body, a sample injection cavity, a separation cavity and an extraction cavity. The chip body is provided with a rotating axis used for being coaxially connected with an output shaft of a centrifugal machine. The sample injection cavity is provided with a sample injection hole; a micro-channel is communicated between the separation cavity and the sample injection cavity; a compressed air cavity is formed in the separation cavity; the minimum distance between the extraction cavity and the rotation axis is larger than the minimum distance between the separation cavity and the rotation axis, a capillary flow channel is communicated between the extraction cavity and the separation cavity, and the minimum distance between the middle of the capillary flow channel and the rotation axis is smaller t