the mason jar main machine comprises an isolation plate and a first sleeve located on one side of the isolation plate, another side of the isolation plate is arranged with a receiving cavity, and a vacuum pump is arranged in the receiving cavity, the first sleeve is used to install the first mason jar body, when the first mason jar body extends into the first sleeve, the vacuum pump draws out the air in the first mason jar body and the first sleeve to seal the first mason jar body to the mason jar main machine;

both ends of the seal converter are respectively arranged with a connecting part detachably connected with the first sleeve and a second sleeve matched with the second mason jar body, and a circle lid is arranged in the second sleeve;

when the second mason jar body extends into the second sleeve, the vacuum pump draws out the air in the second mason jar body and the second sleeve to connect the second mason jar body and the second sleeve, and then seal the second mason jar body to the mason jar main machine, and seal the second mason jar body and the circular lid;

wherein the isolation plate is arranged with an air delivery pipe the receiving cavity is arranged with a solenoid valve and a main board;

the vacuum pump is connected with the main board, the vacuum pump is connected with the air delivery pipe. and the vacuum pump draws air through the air delivery pipe; and

the solenoid valve is connected to the main board and is used to input gas into the first sleeve when it is opened, so as to release the connection between the first mason jar body and the mason jar main machine, and the connection between the second mason jar body and the mason jar main machine.