The invention relates to a novel diamond band saw. The novel diamond band saw is characterized by comprising a steel band, wherein one side of the steel band is provided with a plurality of rectangular concave blades and a plurality of rectangular convex blades, the rectangular concave blades and the rectangular convex blades are arranged in sequence, the rectangular concave blades are concavely formed towards the central axis of the steel band, and the rectangular convex blades are convexly formed away from the central axis of the steel band; the two ends of each rectangular concave blade are connected with the ends of the two corresponding rectangular convex blades correspondingly, the distance between the two ends of each rectangular concave blade is L1, the two ends of each rectangular convex blade are connected with the ends of the two corresponding rectangular concave blades correspondingly, the distance between the two ends of each rectangular convex blade is L2, and L1 is 2-4 mm larger than L2; and the rectangular convex blades are provided with diamond particles. By means of the structure, the novel diamond band saw can achieve the beneficial effects of being good in chip removal effect, improving production efficiency, prolonging service life and the like.