The utility model discloses a bacterial liquid purging device, includes several groups of top hollow bottles and air exchange mechanism connected with them, The ventilation mechanism comprises a luer joint, an air inlet needle and an air outlet needle are inserted into the rubber plug at the bottle mouth of the headspace bottle in a penetrating manner, The bottom of the air inlet needle is inserted into the top of the Luer connector, the top end of the air inlet needle extends to the inside of bacterial liquid in the headspace bottle, and the top end of the air outlet needle extends to the upper part of the bacterial liquid in the headspace bottle. The utility model relates to the technical field of chemical experiments. The bacterial liquid purging device, pure nitrogen can be filled into the headspace bottle by utilizing the ventilation mechanism, In addition, N2O gas is exhausted, so that blowing of bacterial liquid is realized, the operation is simple and convenient, meanwhile, the centralized air supply device is arranged to be connected with the plurality of air distribution blocks, and each air distribution block is connected with the ten headspace bottles, so that blowing of dozens of headspace bottles can be realized at the same time, a plurality of groups of experiments can be carried out at the same time, and the accuracy of experimental data is improved.
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