Automatic screening machine for BGA solder balls

The utility model discloses an automatic screening machine for BGA solder balls. The automatic screening machine comprises a storage hopper, a guide pipe, a flow control valve, a micro motor, an optical fiber sensor, a screening table, a vibration table and a controller. The material storage funnel is arranged at the position corresponding to a feeding port in one side above the screening table, the material guide pipe is arranged on a discharging port of the material storage funnel, the flow control valve is arranged on the material guide pipe, the micro motor is arranged on the material guide pipe on the lower side of the flow control valve, and the lower end of the material guide pipe is located in the screening table; the optical fiber sensor is arranged in the screening table corresponding to the discharging position of the lower end of the material guide pipe, the screening table is arranged on the vibration table, and the flow control valve, the micro motor, the optical fiber sensor and the vibration t