Automatic agricultural chemicals mixer with variable atomization

The invention relates to an automatic medicine-mixing device, in particular to a variable spray medicine-mixing device that medicine and water are stored independently, and spray concentration can be changed in real time. The automatic medicine-mixing device comprises a water tank (1) used for storing water, a one way valve (2) used for preventing liquid medicine from flowing backwards to the water tank (1), a main flowmeter (3) used for detecting the flow rate of water, a medicine mixing chamber (7) used for mixing water with agricultural chemical, a water pump (8) used for supplying energy required for spraying, a plurality of liquid medicine measuring mechanisms (A) and a plurality of medicine spraying mechanisms (B), wherein, the water tank (1) is communicated with the inlet of the medicine mixing chamber (7) by the one way valve (2), the main flowmeter (3) and a pipeline; the liquid medicine outlets of a plurality of liquid medicine measuring mechanisms (A) are communicated with the inlet of the medicine mixing chamber (7); the outlet of the medicine mixing chamber (7) is communicated with the liquid medicine inlets of a plurality of medicine spraying mechanisms (B) by the water pump (8) and a connecting pipe (11). The automatic medicine-mixing device of the invention realizes that the medicine and the water are stored independently, the spray liquid medicine concentration can be controlled in real time, and one kind of medicine or multiple kinds of medicines can be sprayed separately or synchronously.