Rotor shell and fan blade assembling structure capable of being assembled positively and negatively

The utility model provides a rotor shell and fan blade assembly structure capable of being installed positively and negatively, which comprises a rotor shell and fan blades, the rotor shell comprises a cup body and a limiting ring connected to the periphery of the bottom of the cup body, the fan blades comprise a sleeve part and a plurality of blades uniformly distributed on the outer ring of the sleeve part, and annular accommodating grooves matched with the limiting ring are formed in the two end surfaces of the sleeve part. The limiting ring is arranged in one of the annular containing grooves, the sleeve part is arranged on the cup body in a sleeving mode, a plurality of fixing screw holes are evenly distributed in the limiting ring, counterbores corresponding to the fixing screw holes are formed in the bottoms of the annular containing grooves in the two sides, the two corresponding counterbores are communicated, and fixing bolts are connected between the two corresponding counterbores and the fixing scr