The invention discloses a device for detecting hydrogen defect of a hydrogen storage container processing part. A conveying roller bed is arranged on the outer side of a heating furnace and in the heating furnace, a vacuum chamber and a dark chamber respectively; an inlet of the vacuum chamber is connected with an outlet of the heating furnace through the conveying roller bed; an outlet of the vacuum chamber is connected with an inlet of the dark chamber through the conveying roller bed; one side of the vacuum chamber is connected with a vacuum pump and a tritium gas bottle through a pipelinerespectively, and an electric heater is arranged on the other side of the vacuum chamber; an outlet of the dark chamber is connected with a developing chamber; a photographic film is arranged in the dark chamber and is attached to the surface of the hydrogen storage container processing part; in the developing chamber, the photographic film is connected with photographic film developing equipmentthrough a cassette; the fixed photographic film is connected with a computer through a color scanner. The device disclosed by the invention has the following advantages: through the development imaging of beta rays and X rays in a material on the photographic film, the retention severity degree and the distribution condition of hydrogen at a defect position in the tested material are detected andvisually displayed on the computer, and measures can be taken according to the hydrogen-caused injury degree at the position.