The application discloses sand -lined metal mold hydro -cylinder frock includes: the datum plane is provided with square swage on, be equipped with a plurality of hydro -cylinder foundry goods die cavities in the swage, be connected with the?gating?system on the hydro -cylinder foundry goods die cavity, the?gating?system is connected to the pouring basin. The technical scheme who provides according to this application embodiment is through adopting sand -lined metal mold molding technology for the premium casting that foundry goods allowance is few, process yield is high, the tissue is fine and close, mechanical properties, especially pressure?resistance satisfy.