The invention provides a transfusion-creeping united test device of original saturated soil and improved soil and a flow-creeping united test method of original saturated soil and improved soil. The device comprises a sample bearing system, an axial loading system, a stress strain measurement system, a water pressure loading control system, a flow measuring system and a supporting system, whereinthe axial loading system and the water pressure loading control system are connected with the sample bearing system and used for applying load and water pressure to the sample. The stress strain measurement system and the flow measuring system are connected with the sample bearing system and used for measuring the stress strain and flow amount of the sample; the axial loading system and the samplebearing system are connected with the supporting system through a hinge and a supporting foot so as to ensure the stability of the whole device. The device can be used for synchronously measuring theflow coefficient and creeping coefficient of original saturated soil and improved soil, and studying the interaction of the both. The device is simple to manufacture, exact and reliable in measurement result.