The invention provides a bionic nano preparation based on platelet membrane fragments as well as a preparation method and application of the bionic nano preparation, and belongs to the technical fieldof medicine. By means of drug combination of a cyclin dependent kinase 5(Cdk5) inhibitor and a chemotherapeutic drug, on one hand, tumor cells are killed with chemotherapy, the immune system is activated, content of IFN-gamma is recovered, immunosuppression caused by postoperative stress is relieved, on the other hand, PD-L1 is down-regulated by the Cdk5 inhibitor, IFN-gamma related immune drug resistance is relieved, and through combination of the Cdk5 inhibitor and the chemotherapeutic drug, dual characters of IFN-gamma are changed, the downstream immunosuppressive action of the IFN-gamma is removed, and the positive effect of IFN-gamma is exerted; and meanwhile, the problem of postoperative targeted drug delivery is solved according to the biological trend characteristic of platelets,besides, with improvement of the preparation method, the preparation method of bionic nanoparticles based on the platelet membrane fragments is simple, the drug-loading efficiency is high, and therefore, the bionic nanoparticles have good practical application value.