The utility model relates to a large vacuum storage tank jacketing support. The large vacuum storage tank jacketing support is simple in structure, practical and safe and convenient to operate. The large vacuum storage tank jacketing support is composed of a main transverse beam, hanging lugs, reinforcing channel steel, a support, front fixing channel steel, rear fixing channel steel, a transition flitch, an upper connection board and a lower connection board; a plurality of pieces of reinforcing channel steel are welded to the main transverse beam at intervals, the two hanging lugs are welded to the transverse beam front and back, the support is fixed to the lower rear portion of the main transverse beam in an inclined mode through the front fixing channel steel and the rear fixing channel steel, and the upper connection board and the lower connection board are connected with one end of the main transverse beam and one end of the support through the transition flitch respectively. The large vacuum storage tank jacketing support has the advantages that the special hanging support is adopted to be welded to an inner barrel body, the support smoothly penetrates through an outer barrel by means of the hanging lugs on the lengthened channel steel and a hanging-lug-like inner barrel on the other side of the inner barrel body; the structure is simple, and practicality is achieved; operation is safe and convenient.