The invention discloses a medullary core support and a push device thereof and belongs to the field of medical apparatuses and instruments, used for treating femoral head necrosis or other bone injuries. The medullary core support comprises a supporting head and supporting pieces, wherein the surface of the supporting head is spherical crown shaped; the supporting pieces are positioned on two sides of the supporting head and can pop open; the push device comprises a push rod, a clamping joint and a transfer screw; the clamping joint is positioned on the top of the push rod; and the transfer screw is positioned on one side of the clamping joint after extending. The support is connected onto the push device in a compression state, the support is pushed into the medullary cavity by the push device, the medullary core support rotates by a certain angle and then pops open by utilizing the transfer screw, and the medullary core support is supported inside caput femoris so as to prevent collapse of the caput femoris. According to the medullary core support disclosed by the invention, after the operation is performed at earlier femoral head necrosis, further collapse of the caput femoris is avoided, time of enabling a patient to stay in bed is shortened, and the medullary core support is simple and convenient to operate during the operation and firm and reliable after implantation.