The invention discloses a hard sealing safety valve which comprises a valve shell and a liquid inlet connector as well as a valve element component, wherein a liquid inlet is formed in the liquid inlet connector; the valve element component is arranged inside the valve shell; a liquid discharge hole is formed in the valve shell; the valve element component comprises a valve seat and a valve element made of a metal material; a liquid through hole for communicating the liquid inlet and the liquid discharge hole is formed in the valve seat; the valve element is moveably arranged inside the valve seat and is used for controlling opening and closure of the liquid through hole. As the valve element and the valve seat of the hard sealing safety valve disclosed by the invention are both made of the metal material, metallic annular hard sealing contact of the valve element and the valve seat is achieved, the sealing reliability is greatly improved, and the sealing property is good; moreover, due to adoption of the valve element component, on/off of an oil path from the liquid inlet to the liquid discharge hole can be controlled, large-amount overflowing can be achieved, the flow of the hard sealing safety valve is greatly increased, the axial displacement of the valve element component can be reduced due to rapid overflowing within a short time, the axial deformation of a return spring can be reduced when the axial displacement of the valve element component is reduced, and ultimately pressure fluctuation can be reduced.