Devon and Cornwall Police and Crime Commissioner Alison Hernandez said the Knife Angel was an “impactful way of reaching out to young people, organisations and the community”.
“My office’s recent survey of young people and adults identified they worried about people carrying weapons on our streets,” she added.
“The more we can do to deter people from carrying a knife and show that we act to prevent their concerns, the better.”
Sally Haydon, cabinet member for community safety at Plymouth City Council, said: “Plymouth does not face a knife‑crime crisis, and overall incidents here remain comparatively low. But even one incident is one too many and its impact can be lifelong.”
Devon and Cornwall Police will be inviting schools and colleges to take part in educational events around the Knife Angel.
A spokesman added permanent knife surrender bins were available at police stations.