Material metering and automatic feeding device

The utility model belongs to the technical field of material feeding, and particularly relates to a material metering and automatic feeding device. A balance plate is movably connected to a base, one end of the balance plate is fixedly connected with a material disc, a box for containing objects is placed on the material disc, a discharging pipe conducts discharging into a box body, then the balance plate rotates around the base, a second baffle is fixedly connected to the balance plate, and the second baffle is located at the lower ends of two sets of photoelectric relays to block light path transmission. At the moment, a photoelectric relay transmits a signal to a controller, the controller controls a third motor to rotate, the third motor drives a first connecting rod to rotate, and a third baffle is further driven to stop the materials from leaving; a third notch is formed in one side of the other end of the balance plate, a sliding block is slidably connected to the third notch, scale marks are arranged