The invention discloses a sterile ventilating device of a dairy product workshop. The sterile ventilating device comprises a sterilization treatment box, a side cover plate and an upper cover plate. The upper cover plate is arranged on the upper portion of the sterilization treatment box, the side cover plate is arranged on the front surface of the sterilization treatment box, and the side cover plate and the upper cover plate are fixedly connected with the interior of the sterilization treatment box through hinges; and a water storage device is arranged on the upper portion of the inner wallof the sterilization treatment box, and the water storage device is fixedly arranged in the sterilization treatment box through screws. The sterile ventilating device of the dairy product workshop hastriple sterilization procedures, and the interior of a high-temperature sterilizer has seven layers of effective sterilization; internal resources can be reused, and the sterilization effect is high;the sterilization treatment box is connected with a power supply, and a power supply processor starts to work after the power supply is connected; the high-temperature sterilizer, an ultraviolet irradiator, a weeping pipe and the water storage device in the sterilization treatment box operate simultaneously; and the power supply processor is provided with a delay circuit, and the delay circuit enables a fan to start in a delayed mode.