Self-cleaning farm chemical mixing device

The invention discloses a self-cleaning farm chemical mixing device, which belongs to the field of agricultural machinery. The device comprises a fixed frame, a liquid taking assembly and a transmission assembly, wherein the liquid taking assembly comprises a measuring cylinder provided with a lower sealing ring, a liquid spraying pipe and a liquid pumping pipe; the transmission assembly comprisesa rack, a third gear and a gear box; an outlet pipe of a piston cylinder is connected with a three-way valve, one connector of the three-way valve is connected with the upper end of the liquid spraying pipe sequentially through a one-way valve, a pipeline and a rotary connector, the other connector of the three-way valve is connected with the liquid pumping pipe through a one-way valve, and the liquid pumping pipe is placed in a cavity of a liquid containing barrel. Compared with the prior art, the device has the characteristics of convenience, reliability, resource saving and convenience inpopularization. 本发明公开了一种自清