The invention discloses a device and a method for testing the law of fluid migration in the creep of soft rock samples containing ice. The device includes: multi-connected sample tank, XYZ true triaxial pressure system, temperature control system, CT scanner, various parameter sensors and data collector; a plate pressurization device is set in the sample tank, and the plate pressurization device Used to apply local pressure or global pressure to the sample in any direction of XYZ, the plate pressurization device includes a pressurization controller and a pressurization plate, and the pressurization plate includes an upper end pressure plate, a buffer plug and a lower end connected in sequence Pressure plate. The device and method provided by the present invention can not only simulate the graded loading creep, unloading creep, dynamic load creep, cooling-pressure ice-thawing creep test of moraine-containing layer, frozen soil or hydrate layer more realistically, but also can Carry out mechanical parameter analysis test. Moreover, it can detect and analyze the deformation and failure characteristics of rock mechanical structures through various test parameters such as permeability, CT detection, acoustic emission, and conductivity analysis.