Active drug-loaded nanocarriers have been widely employed as efficient drug delivery systems for tumor theranostics. Herein, we report folate-mediated "all-in-one" nanobubbles for tumor-targeted NIR/MR/US imaging and combined chemo-photothermal therapy. The surface-engineered nanobubbles are constructed from oleylamine-/IR-780-loaded hollow structures, folate and the Gd DTPA-BSA@5-FU complex via electrostatic adsorption and further filled with gas after freeze drying. DLS data show that the nanobubbles have a hydrodynamic diameter of 120.41 ± 18.30 nm. TEM observations show a hollow inner cavity and a shell thickness of approximately 10 nm. The relaxivity (r1) of the nanobubbles reaches 16.56 s −1 /mM, indicating suitable features for use as a T1-weighted MR contrast agent. Moreover, due to the gas core inside, the nanobubbles are suitable for ultrasound contrast imaging. Interestingly, ξpotential data and cumulative release measurements demonstrate that the nanobubbles undergo charge-switchable behaviors and pH-/light-sensitive drug-release behaviors after surface engineering, which could facilitate deep tumor penetration and accelerate drug release for efficient killing of cancer cells. In vivo trimodal imaging and chemophotothermal therapy for MGC-803 tumor-bearing mice reveal selective tumor accumulation, long tumor retention, and enhanced antitumor behaviors. Therefore, the all-in-one nanobubbles could be applied for active tumor-targeting theranostics.