Interruptible siphon valve used for centrifugal microfluidic chip and application method thereof

The invention discloses an interruptible siphon valve used for a centrifugal microfluidic chip and an application method thereof. The interruptible siphon valve comprises a siphon pipeline, a sample adding chamber communicating with one end of the siphon pipeline, and a collecting chamber communicating with the other end of the siphon pipeline, wherein the sample adding chamber and the collectingchamber are respectively connected with a vent hole; and the top end of the siphon pipeline is connected with a vent hole. The application method for the interruptible siphon valve comprises the following steps: 1) adding a liquid into the sample adding chamber, sealing a chip, starting a centrifuge, carrying out rotating at a high speed, and allowing the liquid to enter the siphon pipeline underthe action of centrifugal force; 2) stopping the rotation of the centrifuge or setting the centrifuge at a low rotating speed, and allowing the siphon pipeline to be completely filled with the liquidunder capillary action; 3)