Low-pressure pouring mold

The low-pressure pouring mold comprises a mold body and a ventilation ejection device, a cavity is formed in the mold body, the ventilation ejection device comprises an ejection mechanism, a fixing sleeve and an ejection rod, one end of the fixing sleeve communicates with the cavity, the other end of the fixing sleeve faces the ejection mechanism, and one end of the ejection rod is connected with the ejection mechanism; the other end of the ejector rod extends into the fixing sleeve, a first air channel is formed between the ejector rod and the fixing sleeve, a second air channel is formed in the ejector rod, the first air channel is communicated with the second air channel, the second air channel is communicated with the cavity, the ejection mechanism comprises an air ejection body, the air ejection body is communicated with the first air channel, and the air ejection body is suitable for volume change. And the ejector rod is suitable for moving along the fixing sleeve so as to block or open connection betwe