Chip packaging material missing prevention device

The utility model discloses a chip packaging material missing prevention device which comprises a box body, a weighing device is fixedly installed at the bottom of an inner cavity of the box body, a transversely-arranged sliding device is fixed to the upper portion of the inner cavity of the box body, the sliding device comprises driving devices, sliding blocks and sliding rods, the driving devices are fixedly installed at the two ends of the upper side of the inner cavity of the box body, and the sliding blocks are arranged on the sliding rods. A sliding rod is connected between the two driving devices, the sliding rod is sleeved with a sliding block, the sliding block moves on the sliding rod in the length direction, a proximity switch sensor and a photoelectric switch sensor are fixedly connected to the lower bottom face of the sliding block, and four light curtain switch sensors are sequentially arranged on the side face of the box body in the transverse direction. And a metal mesh curtain is arranged bet