Backpack negative-pressure electric ultralow-volume sprayer

The utility model discloses a backpack negative pressure electric ultra-low volume sprayer, which belongs to the technical field of sprayers, and comprises a pesticide box, a bin body is arranged in the pesticide box, and the top side and the bottom side of the pesticide box are respectively connected with a pesticide inlet and a pipe orifice. When the spray pipe is embedded into the bent pipe and the second circular plate is tightly attached to the sealing ring bonded to the open end of the bent pipe, the bottom end of the screw penetrates through the first threaded hole and the second threaded hole at the same time, and the spray pipe and the bent pipe can be connected by being matched with tightening of the nut; only the first nut and the screw need to be unscrewed, and then the spraying pipe is moved upwards to be separated from the bent pipe; the waterproof pads are adhered to the inner side of the bin body, and the water absorption layer is arranged between every two waterproof pads, so that the waterpr