The invention discloses nitrite-free sausages and a preparation method thereof. The preparation method comprises the steps of selection and pretreatment of raw meat, chopping pickling, filling, baking, cooling, packaging and the like, wherein the chopping pickling working step is performed in a vacuum rolling machine, i.e. the treated raw meat is put into the rolling machine, then a mixed picklingsolution composed of various auxiliary materials is added and the raw meat is rolled for 20-40min. The preparation method uses sugar beet extract and salty essence which are compounded as a color reaction agent to be added to the raw meat and substituted for nitrite to achieve various effects. The preparation method realizes zero addition of nitrite or nitrate, produces nutritive, safe and healthy sausages, and can meet the ever-increasing requirements of the market.