The invention discloses a pasty serous fluid food stirring and gas injection device. The pasty serous fluid food stirring and gas injection device comprises a gas injection rotary stirring unit, wherein the gas injection rotary stirring unit comprises a motor transmission shaft, an airbag wrapping column and a suspension column supporting disc; the lower end of the airbag wrapping column is of a conical bottom structure with a small end facing downwardly; the lower end of a motor transmission shaft is connected with a motor, and the upper end of the motor transmission shaft is coaxially connected with the conical bottom of the airbag wrapping column. The pasty serous food stirring and gas injection device is simple in structure, ensures that a given amount of small bubbles can be uniformlyinjected into the flowing colloid serous fluid at an always uniformly-mixed state, and ensures the good consistence; and by adopting an elastic airbag structure, the expansion degree of an elastic airbag under the negative pressure effect can be always kept, so that the air amount released from the elastic storage airbag is consistent at every time, and the consistence of all working periods canbe improved.