Step-by-step pressurization method and device for container gas pressure resistance test

The invention discloses a step-by-step pressurization method and a step-by-step pressurization device for a container gas pressure resistance test. The step-by-step pressurization method for the container gas pressure resistance test comprises the following steps: setting target pressure of each step of step-by-step pressurization in the container gas pressure resistance test, dwell time of each step and an upper deviation value of pressure of the pressure resistance test; after the filling pressure of each stage reaches the set target pressure, pressure maintaining is conducted according to the set pressure maintaining time; after each stage of pressurization reaches the pressure maintaining time, pressure drop judgment is conducted, and if the pressure drop requirement is met, the next stage of pressurization process is conducted till step-by-step pressurization is completed; each stage of pressurization process comprises an offset interval, a stable interval, an I-area pressurization interval, an II-area p