The invention discloses an automatic spraying device with uniform spraying. The automatic spraying device comprises a base, wherein supporting legs are fixedly connected to the bottom of the base; a shell is fixedly connected to the middle of the bottom of the base; a motor is fixedly connected to the right side of the bottom of an inner cavity of the shell; the output end of the motor is fixedlyconnected with a first gear; and the left side of the first gear is meshed with a second gear. By virtue of matched use of the base, the supporting legs, the shell, the motor, the first gear, the second gear, a placing plate, a support, rollers, an iron barrel body, a groove, a first water level sensor, a material discharging pipe, a first pipe sleeve, a box body, a controller, a first feeding pipe, a second pipe sleeve, an alarm module, a water pump, a spray head, a second feed pipe, a discharge pipe, a second water level sensor, a central processing unit and a power supply module, the problem that an existing automatic spraying device is uneven in spraying is solved; and the automatic spraying device has the advantages of being uniform in spraying and worthy of popularization.