The invention discloses a hard concrete hydraulic fracture test piece and an implementation method. The hard concrete hydraulic fracture test piece comprises a die, compact hard concrete and a gap formation member, wherein the gap formation member comprises a gap formation piece, a water inlet pipe and a water outlet pipe, the gap formation member is arranged at a central position of an upper surface of the hard concrete at half capacity of the compact die, the gap formation piece comprises an upper gap formation piece and a lower gap formation piece which are same in structure and are vertically aligned to each other, the upper gap formation piece comprises an upper piece body, an upper pasting sealing belt and an upper pad piece, the upper pasting sealing belt is pasted with an outer edge of a lower surface of the upper piece body, the upper pad piece is arranged at an inner ring of the upper pasting sealing belt, the lower gap formation piece comprises a lower piece body, a lower pasting sealing belt and a lower pad piece, six to ten same spacers are arranged between pasting surfaces of the upper pasting belt and the lower pasting belt at intervals, the upper pad piece and the lower pad piece are water permeable materials, a gap is formed between the upper pad piece and the lower pad piece and is freely filled with water, one end of the water inlet pipe and one end of the water outlet pipe extend to ring circles of the upper pasting belt and the lower pasting belt, and the other ends of the water inlet pipe and the water outlet pipe respectively extend out of two corresponding edge walls of the die.