A high vacuum container includes an inner container body, an outer container body, a first group of supporting devices and a second group of supporting devices. Each group of supporting devices includes four supporting assemblies, and two supporting assemblies are disposed at the upper portion of the high vacuum container, and the other two are disposed at the lower portion of the high vacuum container. Each supporting assembly includes a base plate welded at outer surface of the inner container body and a heat insulating pipe extending along a radial direction of the high vacuum container, one end of the heat insulating pipe abutting against the base plate. Each supporting assembly at the lower portion further includes a fixing element, and each fixing element partly is partly inserted into the outer container body through the opening on the outer container body. Each fixing element has a top plate and a bending portion, and each bending portion bends vertically from the edge of the top plate and towards the inner part of the high vacuum container, and sleeves onto outside of the heat insulating pipe, and outer surface of the bending portion is welded to the outer container body at the opening. The high vacuum container and an adjusting device for adjusting the concentricity of the high vacuum container would be beneficial to high concentricity.