A plan to create an independent Office of Animal Welfare and to put an end to cruel factory farming practices is the cornerstone of the Greens animal welfare policy which will be launched on Sunday.

Upper House MP and Greens spokeswoman for animal welfare, Mehreen Faruqi, will unveil the party's plans to protect animals, saying the creation of an Office of Animal Welfare is long overdue.

Mehreen Faruqi at the Randwick Community Organic Garden. Credit:Louise Kennerley

Dr Faruqi told Fairfax Media that it would for the first time ensure that animal welfare in the state is regulated "without influence" from the government or the agricultural sector.

"Too many animals in NSW are at risk from animal cruelty," she said. "The current system is broken with animal cruelty cases falling through the cracks.