Agricultural sprayer

An agricultural sprayer comprises a material barrel, a power device arranged below the material barrel, an absorption device arranged between the material barrel and the power device as well as a water preventing device, wherein the material barrel comprises a barrel body and a cover body, the barrel body is provided with a water injection port and a neck part arranged at the water injection port, and the cover body is arranged at the neck part so as to seal the water injection port; the water preventing device comprises a body, a baffle edge extending from one end of the body and descending obliquely as well as two side edges descending obliquely from two opposite sides of the body, and the body has an opening allowing extension of the neck part of the material barrel. Therefore, the power device located below the water preventing device can be shielded, overflow spray solution during injection of the spray solution cannot seep into the power device, the power device is started easily and not prone to extinguishment, and the service life can be prolonged.