Swing arm type packaging mechanism capable of being self-adaptive to vacuum shaping of bags with various thickness

The invention discloses a swing arm type packaging mechanism capable of being self-adaptive to vacuum shaping of bags with various thickness. The mechanism comprises a shell and a transverse plate located on one side of the shell, wherein a stepping motor is arranged on one side of the bottom end of the transverse plate, the top end of the transverse plate is provided with a motor swing arm connected with the output end of the stepping motor, and the top end of the motor swing arm is provide with a connecting block matched with the motor swing arm; and a buffer positioning base I is arranged at the bottom end of the side, close to the shell, of the connecting block, a buffer spring I is arranged on the side, away from the motor swing arm, of the buffer positioning base I, a buffer positioning base II is arranged on the other side of the buffer spring I, first sliding blocks I are arranged at the bottom end of the buffer positioning base II and the bottom end of the buffer positioning base I correspondingly, a