A refrigerator, comprising a microfluidic testing system used for qualitatively or quantitatively testing a preset test parameter of a sample liquid, the microfluidic testing system comprising: a microfluidic biochip which is provided with a sample inlet, a communication port and a testing pool formed inside the microfluidic biochip, wherein the sample inlet, the testing pool and the communication port are in sequential communication by means of a micro-channel; and a chip mounting mechanism used for mounting the microfluidic biochip; characterized in that the microfluidic testing system further comprises: a sample liquid driving device in hermetic communication with the communication port, so as to promote the sample liquid in contact with the sample inlet to flow into the micro-channel and flow to the testing pool via the micro-channel; and a testing mechanism used for testing the testing pool to obtain the preset test parameter of the sample liquid; wherein a negative pressure in a main channel is formed by the sample liquid driving device by pumping air outwards, such that the sample liquid in contact with the sample inlet is allowed to enter the main channel under the action of the negative pressure; wherein the sample liquid driving device forms a fluid-tight connection with the communication port through a sealed docking mechanism; and the communication port of the microfluidic biochip is fixedly provided with a plug pin protruding and extending outward, an internal flow channel of the plug pin is in sealed communication with the communication port, the plug pin is inserted into the inside of the sealed docking mechanism and forms a fluid-tight connection with the sealed docking mechanism, and the sealed docking mechanism is in fluid-tight connection with the sample liquid driving device, so that the sample liquid driving device is in sealed communication with the communication port. a microfluidic biochip which is provided with a sample inlet, a communication port and a testing pool formed inside the microfluidic biochip, wherein the sample inlet, the testing pool and the communication port are in sequential communication by means of a micro-channel; and a chip mounting mechanism used for mounting the microfluidic biochip; characterized in that the microfluidic testing system further comprises: a sample liquid driving device in hermetic communication with the communication port, so as to promote the sample liquid in contact with the sample inlet to flow into the micro-channel and flow to the testing pool via the micro-channel; and a testing mechanism used for testing the testing pool to obtain the preset test parameter of the sample liquid; wherein a negative pressure in a main channel is formed by the sample liquid driving device by pumping air outwards, such that the sample liquid in contact with the sample inlet is allowed to enter the main channel under the action of the negative pressure; wherein the sample liquid driving device forms a fluid-tight connection with the communication port through a sealed docking mechanism; and the communication port of the microfluidic biochip is fixedly provided with a plug pin protruding and extending outward, an internal flow channel of the plug pin is in sealed communication with the communication port, the plug pin is inserted into the inside of the sealed docking mechanism and forms a fluid-tight connection with the sealed docking mechanism, and the sealed docking mechanism is in fluid-tight connection with the sample liquid driving device, so that the sample liquid driving device is in sealed communication with the communication port. a sample liquid driving device in hermetic communication with the communication port, so as to promote the sample liquid in contact with the sample inlet to flow into the micro-channel and flow to the testing pool via the micro-channel; and a testing mechanism used for testing the testing pool to obtain the preset test parameter of the sample liquid; wherein a negative pressure in a main channel is formed by the sample liquid driving device by pumping air outwards, such that the sample liquid in contact with the sample inlet is allowed to enter the main channel under the action of the negative pressure; wherein the sample liquid driving device forms a fluid-tight connection with the communication port through a sealed docking mechanism; and the communication port of the microfluidic biochip is fixedly provided with a plug pin protruding and extending outward, an internal flow channel of the plug pin is in sealed communication with the communication port, the plug pin is inserted into the inside of the sealed docking mechanism and forms a fluid-tight connection with the sealed docking mechanism, and the sealed docking mechanism is in fluid-tight connection with the sample liquid driving device, so that the sample liquid driving device is in sealed communication with the communication port.