A sleeve for a gauge-changing wheelset, comprising a sleeve body, the sleeve body comprising: a first sleeve including a first end cover and a first barrel, the first barrel extending toward an axial side of the first end cover in a circumferential direction of the first end cover, the first end cover having an axial through hole; a second sleeve connected with the first sleeve, the second sleeve including a second end cover integrally connected with the first barrel in a circumferential direction of the first barrel and a second barrel extending toward the same side as that of the first barrel extending toward in a circumferential direction of the second end cover; wherein the first end cover is arranged to be securely fixed around an axle of the gauge-changing wheelset, and located inside of wheels of the gauge-changing wheelset, and an inner hub of each of the wheels is configured to extend into the first barrel and be in sliding fit with the first barrel, and a side wall of the first barrel has a through hole for being fit with a locking hole on the inner hub of each of the wheels; a dust cover is connected with an outer circumference of the second barrel; the dust cover comprises an annular cover body and retaining rings disposed at both ends of the annular cover body in an axial direction, at least one pair of electric brushes being disposed at an inner wall of the annular cover body; wherein chips corresponding to the electric brushes one by one are provided at an outer wall of the second barrel, a pair of annular mounting grooves surrounding the outer circumference of the second barrel are provided at intervals in an axial direction of the second barrel, and inner circumferences of the retaining rings are respectively mounted in the annular mounting grooves and the sleeve body is rotated such that the chips rub against the electric brushes to form an electrical connection. a first sleeve including a first end cover and a first barrel, the first barrel extending toward an axial side of the first end cover in a circumferential direction of the first end cover, the first end cover having an axial through hole; a second sleeve connected with the first sleeve, the second sleeve including a second end cover integrally connected with the first barrel in a circumferential direction of the first barrel and a second barrel extending toward the same side as that of the first barrel extending toward in a circumferential direction of the second end cover; wherein the first end cover is arranged to be securely fixed around an axle of the gauge-changing wheelset, and located inside of wheels of the gauge-changing wheelset, and an inner hub of each of the wheels is configured to extend into the first barrel and be in sliding fit with the first barrel, and a side wall of the first barrel has a through hole for being fit with a locking hole on the inner hub of each of the wheels; a dust cover is connected with an outer circumference of the second barrel; the dust cover comprises an annular cover body and retaining rings disposed at both ends of the annular cover body in an axial direction, at least one pair of electric brushes being disposed at an inner wall of the annular cover body; wherein chips corresponding to the electric brushes one by one are provided at an outer wall of the second barrel, a pair of annular mounting grooves surrounding the outer circumference of the second barrel are provided at intervals in an axial direction of the second barrel, and inner circumferences of the retaining rings are respectively mounted in the annular mounting grooves and the sleeve body is rotated such that the chips rub against the electric brushes to form an electrical connection.