The utility model relates to a cantilever beam valve belongs to the microfluidic system field. The utility model discloses a flexure strip, venthole, box and inlet port, the inside cavity that be of box, the upper surface of box is opened there is the venthole, and the lower surface of box division has the inlet port, and flexure strip one end is connected with the box, and the flexure strip other end is crossed behind the inlet port unsettledly. The utility model discloses simple structure, easily processing, can realize the uniflow to gas.