A fluorescent, diselenide‐containing9,10‐distyrylanthracene (DSA) derivative (SeDSA) with aggregation‐inducedemission (AIE) characteristic was successfully synthesized and SeDSA nanoparticles (NPs) were prepared through a nanoprecipitation method. SeDSA could coassemble with an antitumor prodrug, diselenide‐containing paclitaxel (SePTX), which could be obtained by precipitation, to form SeDSA‐SePTX