Vacuum food freshness-retaining tank

The utility model relates to a fresh-retaining tank for vacuum food, which comprises a tank body and a tank cover which are mutually connected. A combination surface of the tank body and the tank cover is provided with a sealing ring; a through hole is arranged in an inward concave cavity of the tank cover; a position on the tank cover, which is corresponding to the through hole, is hinged with a turning cover of which the interior is buckled with a stop cover. The utility model is characterized in that the outer side of the through hole is upwards extended with a flange, and a cavity communicated with the through hole is formed in the flange; the interior of the cavity is provided with a lifting valve core which is matched and sealed with the through hole; a flange opening is connected and fixed with a fixed cover which can be threaded by the upper end of the lifting valve core, and the lifting valve core is limited in the cavity in the flange; the utility model is additionally matched with an air pumping cylinder of which an air pumping opening is matched with the flange opening. The utility model has the advantages of good sealing performance, long service life, convenient operation, etc. and is particularly suitable for the fresh retaining of the food.