The invention discloses a preparation method and application of a nano material with a 
synovitis inhibition function, and belongs to the technical field of 
biology. According to the key point of the technical scheme, the preparation method comprises the following steps that S1, shRNA-LeptinR is constructed, specifically, a synthesized shRNA-LeptinR fragment is inserted into a 
plasmid vector to obtain a recombinant 
plasmid vector, then, the recombinant 
plasmid vector is transformed into 
escherichia coli, and the shRNA-LeptinR plasmid is obtained through extraction; S2, a macrophage membrane is prepared; and S3, 
gene-loaded nanoparticles M2H@RPK is prepared, specifically, the nanoparticles M2H@RPK is prepared by adopting an 
electrostatic adsorption method, the nanoparticles H@RPK is wrapped with the M2 macrophage membrane extracted in the step S2, and a 
polycarbonate membrane repeatedly passes through by using a micro extruder to obtain the nanoparticles M2H@RPK. The preparation method is mainly used for relieving the inflammatory 
cascade reaction in the OA process, and the nano-
system targets the 
cartilage matrix and can effectively relieve 
joint injury and inhibit the severity of overall 
arthritis.