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This invention discloses a gas cylinder permeation test system and method, relating to the field of hydrogen storage cylinder permeation testing. The system includes a test environment control module, whose permeation chamber holds the test cylinder and provides the required ambient temperature, capable of replacing the permeation chamber with an inert gas at a set pressure. A sampling control module, connected to the permeation chamber, extracts the gas from the permeation chamber for analysis. A test cylinder control module fills the test cylinder with test gas and maintains the pressure inside the test cylinder at a set value. A data acquisition and control system controls the test environment control module, the sampling control module, and the test cylinder control module, acquiring the pressure inside the permeation chamber, the temperature inside the permeation chamber, and the pressure inside the test cylinder. It can also calculate the permeability of the test cylinder by combining the gas extracted from and analyzed from the permeation chamber. This gas cylinder permeation test system and method enables automatic and continuous measurement, with high safety and efficiency during the testing process.