Vacuum packaging method and vacuum packaging machine

The invention relates to the technical field of vacuum packaging, and particularly discloses a vacuum packaging method and a vacuum packaging machine. The vacuum packaging method comprises the following steps of S1, using a pressure transducer to detect the current pressure intensity in a to-be-packaged piece, judging whether a pressure intensity difference P between the current pressure intensity and the atmospheric pressure outside the to-be-packaged piece is smaller than P0 or not, and if yes, executing the step S2; if not, executing the step S3; when P is equal to Pmax, executing the step S4, wherein P0 is smaller than Pmax; S2, enabling an air exhaust motor to work at the speed V1 so as to control an air pump to conduct vacuumizing operation on the to-be-packaged piece, and returning to the step S1; S3, enabling the air exhaust motor to work at the speed V2 so as to control the air pump to conduct vacuumizing operation on the to-be-packaged piece, and returning to the step S1, wherein V1 is smaller than