The Australian actress, who is currently filming The Hobbit in New Zealand, urged young people to take part in 'The Oasis: Homeless Short Film Competition' in Sydney yesterday.
The event, which was scheduled to coincide with Young Homelessness Matters Day, involves local students filming three-minute movies about homelessness.
Blanchett told AAP: "Film and theatre and the visual arts I really strongly believe have an exceptional and unique capacity to spread important social issues and help produce change in our community.
"I'd like to encourage school students - both primary and secondary - to not only pick up a camera and participate in the competition but to use the education resource and to delve into the issues and make outstanding films.
"Films that raise awareness, tell really inspiring stories and provide solutions that not only touch our hearts, but provoke us into making real action. These kids who pick up these cameras will be the strategists and policy makers and artists of the future. Get going, pick up those cameras and inspire us."
The winners of the competition will be announced in November.