The present invention discloses a sandwich fish sausage and a processing method thereof. Curdlan, fish, chicken, beef and the like are reasonably matched and processed to fabricate the sausage. As compared with the sausage without the curdlan, the sausage added with the curdlan is more tender and smooth in taste, the water-retaining property and stability of the sausage are enhanced, and the yield is greatly improved. The sausage meets the market demand and modern nutrition requirements, satisfies requirements of various consumers and consumer channels, and especially has the effect of keeping fitness and losing weight for women to eat. The sandwich fish sausage of the present invention is delicious in taste and good in flavor, contains various vitamins A, D, B2, B12 and PP and other nutrients required by human body, and is easily to digest and absorb.