The invention discloses a combined antitumor 
drug. The combined antitumor 
drug comprises an antiangiogenic 
drug, a drug used for inhibiting tumor 
cell proliferation, and an amphiphilic high molecular material; the antiangiogenic drug is a 
prodrug of 
Combretastatin A4, and the drug used for inhibiting tumor 
cell proliferation is a 
camptothecin antitumor drug. The invention also discloses a combined antitumor drug 
nanoparticle preparation, a preparation method, and applications. It is shown by 
cytotoxicity test that the combined antitumor drug 
nanoparticle preparation is capable of inhibiting proliferation of tumour 
cell HT-29 and human 
umbilical vein vascular endothelial cells (HUVEC) obviously, and 
dose-dependent relationship is detected; it is confirmed by scratch injury experiments and lumen formation experiments that the combined antitumor drug 
nanoparticle preparation is capable of inhibiting migration of HUVEC and vascularization; compared with single medication systems, the combined antitumor drug nanoparticle preparation possesses excellent tumor killing effect 
in vivo, clinical application value is high, and application prospect is promising.