Negative pressure bag opening device

The utility model discloses a negative pressure bag opening device, which belongs to the technical field of packaging equipment and comprises an exhaust pipe group and a connecting rod mechanism, the exhaust pipe group is connected with an air extractor, the air extractor operates to drive a pipe orifice of the exhaust pipe group to generate negative pressure airflow, and the exhaust pipe group comprises a first exhaust pipe and a second exhaust pipe; the connecting rod mechanism comprises a first clamping rod clamped on the first exhaust pipe and a second clamping rod clamped on the second exhaust pipe, a first rotating pair is hinged to the first clamping rod, and a second rotating pair is hinged to the second clamping rod; the first revolute pair and the second revolute pair are connected together through the short rod, and when the power device controls the second revolute pair to rotate, the first revolute pair is driven by the second revolute pair to rotate in the opposite direction, so that the first e