A fluid pulse energy storage safety valve for a three-screw pump comprises a mechanical sealing outer ring, a valve rod, a spring, a lower cap, an upper cap, a valve body, a locking ring, a vibratingfilm, a limiting cover, a limiting sleeve, an adjusting push rod and a push rod sleeve. The valve body is of a hollow structure and is divided into an upper cavity, a middle cavity and a lower cavityby an upper protrusion and a lower protrusion. The upper surface of the upper cavity of the valve body is provided with an upper valve hole. The upper cap is mounted in the upper valve hole. A throughflowing hole is formed in the side face of the middle cavity. The upper surface of the upper protrusion is provided with an annular ring groove, and the vibrating film is placed on the annular ring groove and fixed by the locking ring. The locking ring and the upper protrusion of the valve body are connected. The limiting cover is fixed to the lower surface of the upper protrusion. One end of thevalve rod is fixed to the lower protrusion through the mechanical sealing outer ring, the other end of the valve rod is connected with the limiting sleeve, and the valve rod is sleeved with the spring. According to the fluid pulse energy storage safety valve for the three-screw pump, through deformation of the vibrating film, the pressure pulse of an outlet of the three-screw pump is reduced, vibration and noise of the three-screw pump are reduced, and thus the operation life of the three-screw pump is prolonged.