The invention discloses an automatic weighing device used for a tea production line. The automatic weighing device comprises a rack, a conveying device, a feeding box, a turning device, a driving motor, a discharging port, baffles, a hopper, a controller, a rotating shaft, first cover plates, a turning plate, gravity sensors, springs and second cover plates. The turning device comprises the rotating shaft and the turning plate, one end of the rotating shaft is connected to the driving motor, and the other end of the rotating shaft is installed on the feeding box. The heights of the baffles are higher than that of the discharging port. A display device is arranged on the rack, the weight of materials on the turning plate can be directly displayed by the display device, and meanwhile, relevant parameters can be preset on the display device. The controller controls the conveying device, the driving motor and the display device. The automatic weighing device used for the tea production line is easy and convenient to operate and simple in structure, time and labor are saved, the problems that manual weighing is troublesome, the working process is complex, and working efficiency is low are solved, and the automatic weighing device is suitable for application and promotion.