Integrated disposable anti-backflow negative pressure drainage device

The utility model discloses an integrated disposable anti-backflow negative pressure drainage device which comprises a drainage device body, connectors are installed at the top and the bottom of the drainage device body, the connector at the top of the drainage device body is integrally connected with the bottom of a liquid one-way valve in a glued mode, and the top of the liquid one-way valve is further integrally connected with a drainage bag in a glued mode through a catheter. A connector at the bottom of the drainage device body is connected with a catheter through glue, and scale marks are marked on the drainage bag. The drainage device is reasonable in structural design and easy and convenient to use, the liquid one-way valve is additionally arranged at the top of the drainage device body, it is ensured that liquid can only be introduced and cannot flow out in the reverse direction in the actual drainage process, the situation that sucked objects flow back is avoided, nursing medical staff do not need t