The utility model discloses a rock core holder can shake out, including overcoat, packing element, the packing element cover is at the radial lateral surface of rock core, the overcoat is establishedto the outside cover of packing element, form the annular space between overcoat and the packing element, the overcoat is seted up radial ring and is pressed pump connector, and this ring presses pumpconnector inwards to communicate the annular space between overcoat and the packing element. Push pipe before rock core axially forward end face is connected, the perforating hole is offered at preceding push pipe center, and the perforating hole front end is the inlet. Preceding push pipe is fixed on the overcoat through preceding end pressure cap. Rock core axial rear end face sets up the screen cloth. First back push pipe is connected to the screen cloth rear end. Push pipe behind the first back push pipe rear end connection second. The push pipe is fixed on the overcoat through back end pressure cap behind the second, and push pipe rear end mouth is the liquid outlet behind the second. The utility model discloses can be with the rock core exit end stratum particle as much as possible's that migrates among the displacement process discharge to displace liquid in.