The invention provides a novel powder for an inner-tough and outer-rigid wear-proof iron-base alloy by laser additive manufacturing. Used inner alloy powder is a low alloy steel powder material and outer alloy powder is a wear-proof iron-base alloy composite powder material. With the adoption of a laser melting deposition technology, a novel inner-tough and outer-rigid wear-proof iron-base alloy component is subjected to laser additive manufacturing by utilizing an optical fiber laser-machining system, the prepared iron-base alloy is uniform in structure, has the characteristics of high surface strength and rigidity and excellent core toughness, and is used for manufacturing shaft type parts which are complicated in shape, large in size and have high requirements on toughness and the wear-proof property. The novel alloy powder material is provided for the inner-tough and outer-rigid wear-proof iron-base alloy shaft type parts.