The invention relates to the technical field of running shoes, and discloses a running shoe with a physical foaming spherical sole, which comprises a sole, a midsole, a vamp, a tongue, a shoelace and a
heel, a tightness adjusting
assembly is arranged on the outer wall of the
heel, the tightness adjusting
assembly comprises a fixing sleeve, one side of the fixing sleeve is fixedly connected to the outer wall of the
heel, and the other side of the fixing sleeve is fixedly connected to the midsole. A limiting ring is fixedly connected to the interior of the fixing sleeve, the outer wall of the limiting ring is in threaded connection with a threaded cap, through holes are formed in the two sides of the fixing sleeve, fixing lugs are symmetrically and fixedly connected to the outer wall of the heel, and a
rope is arranged in the two fixing lugs. By adjusting the wrapping tightness of the heel, the heel is tightly attached to the foot, the attaching degree of the running shoe and the foot is improved, the stability of the heel is enhanced, the
ankle sprain risk is reduced, meanwhile, the running shoe can adapt to the heel sizes of different foot types, and the problem that the foot slides or is locally pressed and uncomfortable in the sports process is effectively solved.