In this paper a machine for bi owaste shredding was designed. Shredding is conducted on the following way. After the certain amount of bio waste mass is collected, that mass is thrown in the machine which is powered by electro motor. The knives which are placed on the shaft shredd the bio waste and that is the way the shredded mixture of bio waste is being made. That mixture is gathered beneath the machine in a container which is already prepared for gathering the shredded bio waste. Water is added to the mixture afterwards to enable anaerob dissolving, fermentation and subsequent methane and high quality bio-fertilizer gain.