Pulsation vacuum steam sterilizer

The utility model discloses a pulsating vacuum steam sterilizer which comprises a bottom plate, a mainframe box fixedly connected to the upper end of the bottom plate, a heater fixedly connected to the upper end of the mainframe box, a steam tank fixedly connected to the upper end of the heater, a sealing cover arranged at the upper end of the steam tank, a lower limiting ring fixedly connected to the steam tank, and an upper limiting ring fixedly connected to the side end of the sealing cover. A sealing ring is arranged at the upper end of the lower limiting ring; the upper limiting ring is fixedly connected with the sealing ring through a bolt; the limiting frame is fixedly connected with the bottom plate through a supporting column, a sterilization tank is arranged in the limiting frame, the sterilization tank is fixedly connected with a first check valve through a first guide pipe, and the first check valve is fixedly connected with the steam tank through a second guide pipe. The lower limiting ring, the