The invention relates to a water storage type low noise inlet valve body and a method; the inlet valve body comprises an inlet valve main body, and an inlet pipe connected with the inlet valve main body and supply water for the inlet valve main body; a position, higher than the inlet valve highest water level, of the inlet valve main body is provided with an open to atmosphere port; the liquid level in the inlet valve body is directly connected with the atmosphere through the open to atmosphere port, thus realizing anti-siphon; a water outlet channel of the inlet valve main body comprises a main water path and a plurality of auxiliary water paths connected with the main water path; a water inlet channel of the inlet valve main body can simultaneously inject water into the main water path and the auxiliary water paths; water outlet flow rate of the auxiliary water paths is smaller than the water inlet flow rate; the auxiliary water paths store water, and separate the main water path from the open to atmosphere port; the main water path and the atmosphere are connected in an isolation manner. The inlet valve body can satisfy the ENISO3822 requirements in which water inflow noises of the inlet valve need to be lower than 20 db, and can satisfy EN1717 inlet valve anti-siphon requirements. The inlet valve body is simple in structure, convenient in mounting, and low in cost.