Automatic chemical adding and spraying system

The invention discloses an automatic chemical adding and spraying system which comprises a chemical box, wherein the bottom of the chemical box is connected with a chemical water pump through a chemical outlet pipe, the water outlet end of the chemical water pump is connected with a mixing water tank through a first connecting pipe, the bottom of the mixing water tank is connected with a mixing water pump through a water outlet pipe, a water outlet of the mixing water pump is connected with a header pipe through a second connecting pipe, a spraying water pump is connected to the end of the header pipe, a water inlet of the spraying water pump is connected with a water inlet pipe, the middle of the header pipe is connected with the mixing water tank through a third connecting pipe, the end, away from the water inlet pipe, of the header pipe is fixedly connected with a spraying pipe, the end, away from the header pipe, of the spraying pipe is fixedly connected with a nozzle, and a pipe body of the header pipe i