Vacuum detection device for interlayer of low-temperature storage tank

The utility model relates to the technical field of vacuum equipment, in particular to a vacuum detection device for an interlayer of a low-temperature storage tank, and aims to protect a vacuum gauge tube and facilitate later replacement and installation of the vacuum gauge tube. Comprising a protective sleeve, a first tube body, a first joint, a valve body, a second joint and a vacuum gauge tube, the protective sleeve is arranged on the surface of the outer container, and a cavity for containing objects is formed in the protective sleeve. The first pipe body penetrates through the outer container and extends into the vacuum interlayer; the first connector is arranged on the end face, extending out of the outer container, of the first pipe body. The valve body is arranged on the first joint; a second joint is arranged on the valve body; the vacuum gauge tube is arranged on the second joint; and when the valve body is opened/closed, the first pipe body is connected/disconnected with the vacuum gauge pipe. 本实用