Present invention provides biodegradable cow dung collector bag that can be used for efficient collection of dung in the collection bag directly, and transportation of dung to biogas plants.. The collection bag is attached to the opening area of the animal for the dung collection. It is a small, light and animal friendly bag. The bag is made up of biodegradable material so that it can be disposed directly to the waste storage sites, as a fertilizer or in the biogas digesters.