Pulsation vacuum steam sterilizer

The utility model belongs to the technical field of medical vacuum sterilizers, and discloses a pulsation vacuum steam sterilizer which comprises a shell and a vacuum pump, an inner cabin is arranged in the shell, an exhaust port and a first valve body are arranged on the shell, the exhaust port is communicated with the inner cabin, and when the first valve body is in an open state, the first valve body is communicated with the vacuum pump. The exhaust port is used for exhausting positive-pressure gas in the inner cabin, so that the air pressure of the inner cabin is equal to that of the external environment; the vacuum pump is used for pumping air pressure in the inner cabin to a vacuum state. The process of converting the gas in the cabin from the positive pressure state to the vacuum state is divided into two processes, in the first process, the positive pressure gas in the inner cabin is exhausted to the air pressure equal to the external environment, in the second process, the air pressure in the inner c