The utility model discloses a bearing structure that floats for automobile engine cooling water pump assembly, including float the cover body with set up at the internal wedge kicking block of cover that floats, the cover body that floats for the tubular structure, is equipped with in its bottom and holds the pump case cavity, the top that is equipped with through -hole and the cover body that floats in the cavity communicates with each other, diameter of hole is greater than the pivot diameter of installation on the pump body, the wedge kicking block includes wheel hub pressure equipment kicking block and impeller pressure equipment kicking block, and the diameter at smaller end of wheel hub pressure equipment kicking block directly is less than pivot bearing diameter, and the butt diameter of wheel hub pressure equipment kicking block is less than the cavity diameter, is equipped with the kicking block pressure equipment hole that the diameter is greater than water pump pivot diameter on the central line of wheel hub pressure equipment kicking block, the diameter at smaller end footpath of impeller pressure equipment kicking block is the same with water pump pivot diameter, and the butt diameter of impeller pressure equipment kicking block is less than the cavity diameter. Adopt the utility model discloses the water pump assembly of frock pressure equipment owing to protected the bearing to avoid the damage, so greatly improved water pump installation precision, feels smooth when rotatory, thoroughly eliminated the hidden danger of the overheated phenomenon emergence of bearing, has both reduced the vibration?and?noise of engine during operation, has lengthened the life of water pump again.