Local leakage detection method and device of container

The invention relates to a local leakage detection method and device of a container, and belongs to the technical field of container detection. A cylinder on a detection cover (1) is connected with a first end of a three-way joint (2), a second end of the three-way joint (2) is communicated with a pressure gauge (4), and a third end of the three-way joint (2) is communicated with a pipeline (3) under pressure; and a door-shaped clamp (6) is arranged over the detection cover (1), the center line of the door-shaped clamp (6) is overlapped with that of the detection cover (1), columns at the two sides of the door-shaped clamp are fixedly connected with the container, and the bottom of a threaded pair (7) matches the cylinder on a detection cover (1). The detection device can be mounted rapidly to form, together with a leakage repair portion of the container, a local enclosed space, the air pressure gauge is provided, the magnitude is accurate, local leakage detection can be completed by a single person independe