Straight strip length screening machine

The invention relates to a straight strip length screening machine which comprises a supporting frame and a vibrating plate arranged on the supporting frame, a feeding pipe is arranged above one side of the vibrating plate, a discharging plate is arranged at the end, away from the feeding pipe, of the vibrating plate, a waste opening is reserved between the vibrating plate and the discharging plate, and a collecting box is arranged below the discharging plate. The vibrating plate is obliquely arranged downwards in the direction from the feeding pipe to the discharging plate, a vibrating assembly for driving the vibrating plate to vibrate is arranged below the vibrating plate, a plurality of screening plates are arranged above the vibrating plate in the direction from the feeding pipe to the discharging plate, and screening grooves are formed between the adjacent screening plates and the vibrating plate. Cut long-strip-shaped snacks are conveyed to the vibrating plate through the feeding pipe, the vibrating pl