The invention discloses a trace corrosive gas environmental test box and belongs to the technical field of environment friendliness and material corrosion research. The trace corrosive gas environmental test box comprises a clean air supply module, a trace corrosive gas generation module, a sample corrosion test reaction module, an air recovery module and an in-situ image acquisition system. A multi-gas-path trace corrosive gas environmental test box which can perform in-situ observation on the surface state of a sample and control temperature to be 25 to 80 DEG C, humidity to be 40 to 97 percent and the concentration of the trace corrosive gas to be 10 to 10,000ppb is implemented. The trace corrosive gas environmental test box has the advantages of occupying small floor, along with simple structure, convenience in operation, light pollution, high accuracy, capacity of controlling temperature, humidity and the concentration of polluted air simultaneously and acquiring images of a sample state in real time, and can be applied to scientific research and engineering experimental research.