The utility model discloses a batch meter ventilation mechanism and a batch meter with the ventilation mechanism. The ventilation mechanism comprises air vents and a plurality of dust guard plates arranged in a side by side mode along length directions of the air vents. The dust guard plates cover the air vents in directions perpendicular to the length directions of the air vents. The two ends of the dust guards are bent to form arc-shaped segments. The centers of circles of the arc-shaped segments are orientated towards the air vents. The lower ends of the two arc-shaped segments of each dust guard plate are respectively fixed on the two sides of the corresponding air vent. A gap is arranged between each two adjacent dust guard plates. A baffle plate, corresponding to each gap, is arranged in each air vent. When the ventilation mechanism is used, none silk screen needs to be used in a box body of the batch meter, so that the structure in the batch meter is simplified while simultaneously guaranteeing heat radiation and dustproof and foreign-material-proof functions of the box body so as to save manufacturing costs. According to the batch meter of the utility model, through arrangement of the ventilation mechanism at the top portion and the bottom portion of the box body, a good heat radiation effect is realized; a coaming plate is arranged at the periphery of a box cover to shield the ventilation mechanism so as to realize concealment of the ventilation mechanism.