The utility model relates to a tool for assembling and tighting the spindle bearing of the tail part of the spinning frame, comprising a sleeve barrel 1 and a handle 3. Four equal division gears 2 are provided on one end of the sleeve barrel 1. The handle 3 is provided on the circular column surface of the sleeve barrel 1. The utility model has artful design and reasonable design. The utility model is used for assembling the spindle bearing of the tail part of the spinning frame and tighting the special tool, and the utility model is tightly convenient, and quick. The efficiency of the assembly is shortened from 5 minutes / station to 1 minutes / station. The special tool is sleeve barrel type, and the special tool is uniformly distributed and the shape of the special tool is four-toothed. The special tool is fastened in the four concave slots of the locking nuts. The handle is rotated, and the stress of the locking nut is uniform, and parts are not damaged, and the parts have not seven diseases. The utility model conforms to the requirement of the cleaning assembly, and the utility model has reliable locking effect.