The application discloses a hydraulic coupling rock and soil analysis device and a control method thereof. The analysis system comprises a closed container, a clamping part, a temperature controller,a servo pressurizing device, a CT scanning device and a data acquiring control system, wherein a closed space for accommodating a sample is formed inside the closed container; a humidity sensor is arranged on the closed container; the clamping part is arranged inside the closed container and is used for fixing the sample; the humidity controller is closely connected with the closed container by apipeline and is used for controlling the humidity in the closed container; the side wall of a hydraulic cylinder of the servo pressurizing device closely penetrates through the bottom of the closed container; a loading piston of the servo pressurizing device is used for axially loading the sample; the CT scanning device comprises a ray source and a detector which are used for carrying out CT scanning on the sample and are respectively arranged on two sides of the closed container in a mode of rotating along the closed container; the data acquiring control system is connected with the humiditysensor, the temperature controller and the CT scanning device; CT scanning and measurement of the sample at different pressures and different humidities can be realized.