The utility model provides a bearing chain wheel's wheel body structure, it ensures to inlay the stability of adorning in the width direction of the belt of wheel body inner groovy or track, guarantees the steady running of excavator. It includes inboard wheel body, outside wheel body, lasso spare is equipped with to the centre of the outside wheel body, inboard wheel body terminal surface butt joint and cover in opposite directions, the both sides of lasso spare respectively with welded connection between outside wheel body, the inboard wheel body, well location is protruding in pairs for theglobal outer convex of outer loop of lasso spare, the protruding width direction location that is used for belt or track in centering location.