The invention relates to a fitting for connecting tubular buses. The fitting for connecting tubular buses includes a bus hoop whose axis extends along a horizontal direction, and the bus hoop is connected with a grading ring which is annularly arranged in the periphery of the bus hoop and whose axis extends along the horizontal direction through a grading ring support. The fitting for connecting the tubular buses which is provided by the invention occupies small space and can prevent a corona from being generated.