Drainage device with filtering function

The utility model provides a drainage device with a filtering function, which relates to the technical field of drainage devices and comprises a drainage rod, a hopper body is fixedly mounted on the surface of the drainage rod, a communication port is arranged at the bottom of the hopper body, a cotton filter block is sleeved inside the hopper body, a through hole is arranged inside the cotton filter block, and the through hole is communicated with the through hole. The drainage rod is inserted into the through hole, the bottom end of the cotton filter block is conical, the surface of the drainage rod is sleeved with a cylinder, the top end of the cylinder is fixedly provided with an ejector rod, and the ejector rod is inserted into the communicating opening. According to the utility model, through the arrangement of the hopper body, a worker can put the cotton filter block into the hopper body, so that liquid can be filtered directly through the cotton filter block while the drainage rod is used for liquid d