The invention relates to the field of part packaging, and particularly discloses a screw metering and packaging system. The screw metering and packaging system comprises a conveying belt, a counting device and a packaging device. The conveying belt is arranged horizontally. Conveying grooves for containing plastic plates are arranged on the conveying belt. Multiple vertical first through holes areformed in each conveying groove. The counting device comprises a mounting box, a feeding groove and multiple arrangement units. The packaging device comprises a pressing block and a telescopic air cylinder. The air cylinder is fixedly mounted above the conveying belt, and the pressing block is fixedly mounted at the lower end of the air cylinder. Multiple second electric heating wires are arranged on the lower end face of the pressing block. The pressing block can be opposite to the conveying grooves, and the shape of the cross section of the pressing block is consistent with that of the cross sections of the conveying grooves. According to the scheme, screws can be arranged and packaged.