Abstract: A three-dimensional flow velocity vector, energy and mass gauge is provided, wherein it comprises an elastic leather cover, both ends of which are mounted with a rigid sealing plug, separately, the elastic leather cover and the rigid sealing plug forming a cylindrical sealing cavity, in which a cable connecting line hole is installed on the upper rigid sealing plug, while an injection hole for injecting liquid into the cylindrical sealing cavity, on which a sealing plug is provided, is installed on the lower rigid sealing plug; and a measuring device for measuring the flow velocity vector and energy and a device for measuring the mass are installed in the cylindrical sealing cavity. The gauge has the advantages of a simple structure, convenient manufacturing and comprehensive detection.