Provided is a hybrid nanoparticle, including an aggregate assembled from a plurality of polymeric molecules, and a plurality of boron-doped graphene quantum dots localized in the aggregate. The polymeric molecule is preferably a pH-responsive dendrimer; the polymeric molecule and the boron-doped graphene quantum dot may be separately associated with different drugs; and hybrid nanoparticle may further include a targeting molecule, such as a rabies virus glycoprotein. Also provided is a method of controlling disassembly of a hybrid nanoparticle, including applying a high-frequency magnetic field to the hybrid nanoparticle to induce disassembly thereof. Also provided is an application of the hybrid nanoparticle for preparing a tumor-penetrating drug carrier.