Automatic water sample collecting device for environmental protection

The utility model belongs to the related technical field of water sample collection, and particularly relates to an automatic water sample collection device for environmental protection. When a water collection bottle rotates along with a bearing disc, a first butt-joint disc and a second butt-joint disc are extruded, so that the second butt-joint disc is contracted into a movable groove, then the bearing disc stops rotating, and under the action of a reset spring, the water sample is automatically collected. The second butt-joint disc moves downwards and resets, a turning cover at the end opening of the first butt-joint disc is pushed downwards, at the moment, a water sample in the water outlet pipe can be conveyed into a water collection bottle through the second butt-joint disc and the first butt-joint disc to be stored and collected, after collection is completed, the bearing disc continues to rotate, the second butt-joint disc is squeezed to retract, and the water sample is collected. The first butt-join