Flowing passage air pumping structure applied to high-vacuum mold

The invention discloses a flowing passage air pumping structure applied to a high-vacuum mold. The structure comprises an upper mold, a lower mold and a cavity, left and right sides of the cavity areconnected with a first flowing passage and an air discharging groove respectively, the first flowing passage and the air discharging groove are provided with air pumping devices, and a buffering component which is used for slowing down the flowing speed of metal liquid is arranged on the part, located between the air pumping device and the first flowing passage, of a first air outlet. After the first flowing passage is provided with the first air outlet and the air pumping devices, the vacuumizing efficiency of the cavity can be accelerated to prevent metal liquid from accidentally entering the pumping devices, a buffering component is arranged in the periphery of the first air outlet, so that metal liquid pauses when gushes to the first air outlet hole to provide more closing time for theair pumping device locate