Automatic water sample collecting device

The automatic water sample collecting device comprises a water tank, a water sampling bottle and a sealing assembly, the water tank comprises a tank body and a cover plate, an opening is formed in the tank body, the cover plate is detachably connected to the tank body and blocks the opening, the water sampling bottle is located in the water tank, and a bottle opening of the water sampling bottle faces upwards; the sealing assembly comprises a sealing cover, a buoyancy block, a rubber plug and an elastic rope, the sealing cover is detachably connected to the water sampling bottle, a water inlet is formed in the sealing cover, the rubber plug is located in the sealing cover and located below the water inlet, the buoyancy block is connected to the sealing cover and located above the water inlet, and the two ends of the elastic rope are connected with the rubber plug and the buoyancy block respectively. The rubber plug can move in the vertical direction so that the rubber plug can be provided with a water inlet p