The invention discloses a directional sequencing device for prawns. The directional sequencing device mainly comprises a rack, an orientation mechanism, a vibration supplying mechanism and a conveying mechanism, wherein a sorting mechanism is aslant arranged on the rack, and comprises a bunker and a plurality of groups of orientation units arranged in parallel. The directional sequencing device completes the directional sequencing of the prawns in an upper sliding groove and a lower sliding groove by fully utilizing the physical characteristic of the prawns, a regular vibration force provided by the vibration supplying mechanism and the gravity of the prawns through arranging a curved surface of a direction selecting slide and a directional slide in the orientation mechanism, and is simple in structure and convenient to operate. The directional sequencing device for the prawns is capable of effectively realizing that the prawns are directionally sequenced and the prawns with same sizes are output, and is used in the field of food machinery.