Self-cleaning nozzle, spraying device and control system

The invention relates to a self-cleaning nozzle, a spraying device and a control system. The self-cleaning nozzle comprises a shell, a mixing cavity is formed in the shell, a first cavity and a second cavity are formed in the two sides of the mixing cavity respectively, a spraying opening communicated with the mixing cavity is formed in one side of the shell, and air inlets communicated with the mixing cavity are formed in the side, away from the spraying opening, of the shell; the first liquid supply port is communicated with the first chamber; the second liquid supply port is communicated with the second chamber; a mixing column is arranged in the mixing chamber, a first liquid outlet communicated with the first chamber and a second liquid outlet communicated with the second chamber are respectively formed in the inner wall of the mixing chamber, and the first liquid outlet and the second liquid outlet are respectively opposite to the mixing column; through the design, the nozzle is prevented from being blo