The solubility of boron nitride nanosheets (BNNSs) in different organic solvents is smartly tuned by using a “Janus” modifier, P(S-b-MMA), which enriches our choice of organic solvents for BNNSs, including low-boiling-point acetone, alkanes, cycloalkanes and benzene series, that are viewed as nonsolvents of BNNSs.