Feeding and discharging system for circuit boards

The invention discloses a feeding and discharging system for circuit boards. The feeding and discharging system for the circuit boards is characterized by comprising a rack, wherein the rack is provided with a corner conveying device and a centered conveying device; the corner conveying device is provided with a linear moving roller train, a limiting stopping block, a lifting corner roller device and a transitional roller; the lifting corner roller device is arranged below the linear moving roller train; the centered conveying device is provided with a drum-shaped bamboo joint roller train and a conveying section roller sheet group; an adjusting positioning mechanism is arranged in the middle of the drum-shaped bamboo joint roller train; an operating panel is arranged on one side of the rack; an electric box is arranged on the bottom of the rack; and a height adjusting device is arranged at the lower end of each supporting leg of the rack. Compared with the prior art, the feeding and discharging system for th