Rolling type floating coupling without hole shrinkage

The utility model discloses a non-reducing rolling type floating coupling which comprises an outer shell, the outer shell comprises an outer straight cylinder, the two ends of the outer straight cylinder are connected with tapered cylinders respectively, and the two tapered cylinders are symmetrically arranged; vertical cylinders are connected to the ends of the conical cylinders, and an annular step is further arranged in one conical cylinder; a blind plate is arranged in the outer straight cylinder; the annular step is positioned at the lower part of the blind plate; a liquid storage tank is further arranged in the outer straight cylinder, two liquid outlets are formed in the liquid storage tank and blocked through rubber plugs, and the ends of the rubber plugs are blocked through blind plates. According to the rolling type floating coupling, the inner drift diameter of the outer shell is consistent with the inner drift diameter of a sleeve, an inner pipeline cannot be blocked, and the problem that a large-