The invention discloses a circumpennate steel fiber, which at least comprises a main rod and at least three sub-rods. The sub-rods are mounted on the main rod, the extension directions of the sub-rods and the axis of the main rod form acute angles, and the sub-rods are arranged in an annular manner along the radial direction of the main rod. The main rod and the sub rods are combined to form a stereochemical structure, so that a multi-directional special force-bearing system is established, and the problem of stereoscopic enhancement of the mechanical property of concrete by conventional steel fibers is overcome. Through adoption of the structure above, the compression resistance, fracture resistance, rupture strength and toughness of concrete are improved. Since the included angles between the main rod and the sub-rods are small, the concrete is easy to disperse in a stirring process, excellent in construction property and good in operationality and practicality.