Sampling device for sewage treatment

The utility model discloses a sampling device for sewage treatment, which comprises a control handle, the outer wall of one side of the control handle is fixedly provided with two fixing sheets, the outer walls of the two fixing sheets are provided with rotating holes, the inner walls of the rotating holes are movably connected with a winding rod through bearings, the outer wall of the winding rod is connected with an insulated wire in a winding manner, and the insulated wire is connected with the control handle. And a semi-arc-shaped fixing cylinder is fixedly arranged at one end of the bottom of the insulated wire. Magnetic force is generated through the second electromagnet, the second electromagnet adsorbs the second stainless steel iron sheet, the sealing cover plate moves downwards on the outer wall of the sampling bottle, the calibration hole is overlapped with the water inlet, sewage flows into the sampling bottle, the first electromagnet is opened, the first stainless steel iron sheet is adsorbed thr