The utility model discloses a concrete crack simulation structure. The device comprises a concrete test block with a cubic structure and an iron wire poured in the concrete test block, wherein a plurality of drill holes for injecting a concrete expanding agent are vertically drilled in the top of the concrete test block, the drill holes are located in the same row, the straight line where the ironwire is located is perpendicular to the plane where the drill holes are located, H is the thickness of the concrete test block, and the height gamma between the iron wire and the bottom of the concrete test block meets the condition that gamma is larger than 0 and smaller than H-h. The utility model has a novel design, a concrete expanding agent is poured into the rows of drill holes to simulateconcrete cracks, the rows of drill holes can induce formation of the concrete cracks, the iron wires are poured into the concrete test block, it is guaranteed that the concrete test block cannot be broken into two halves after the cracks occur, the manufacturing cost is low, natural cracks in actual engineering can be simulated, and practicability is high.