Plant protection pesticide spraying device capable of automatically supplementing and blending pesticide

The invention relates to the field of agricultural machinery, in particular to a plant protection pesticide spraying device capable of automatically supplementing and blending pesticide, which is characterized in that an auger conveying device is arranged in a powder blending box, a discharge port of the auger conveying device is in butt joint with a first end of a first conveying pipe, and a second end of the first conveying pipe is connected with a mixing box; a discharging port of the liquid batching box is in butt joint with the mixing box through a second conveying pipe, a flowmeter and a first electromagnetic valve are arranged on the second conveying pipe, a discharging port of the mixing box is in butt joint with the pesticide storage box through a third conveying pipe, and a second electromagnetic valve is arranged on the third conveying pipe; a pesticide outlet of the pesticide storage box passes through the pesticide pump and the spraying assembly, the spraying assembly is continuously sprayed thro