Check valve, container and water pick

The one-way valve is made of elastic materials and comprises a valve body portion with a hollow structure, an opening communicated with the hollow structure is formed in the top of the valve body portion, the valve body portion comprises two oppositely-arranged connecting walls and two oppositely-arranged sheet membranes, and the two opposite sides of the connecting walls are connected with the two sheet membranes respectively. The tops of the two sheet films are far away from each other, and the bottoms of the two sheet films abut against each other. After the one-way valve is installed on the container, the two sheet films with the bottoms abutting against each other disconnect a connecting channel between the hollow structure of the one-way valve and the inner cavity of the container, and then the leakage-proof effect is achieved. And when the air pressure in the container is smaller than the external atmospheric pressure, the external atmospheric pressure can prop open the two sheet membranes, so that the