The utility model relates to a remolding fine-grained soil test sample preparation device. The remolding fine-grained soil test sample preparation device is characterized in that a sample preparation device body composed of a cover plate (1), a base (2) and a sample preparation barrel (3) is arranged on a lower press plate (11), the lower end face of the cover plate (1) is connected with a porous stone (4) and a sample preparation cutting ring (6), vent holes (8) are formed the cover plate (1), and a pressure device (9) is arranged on an upper press plate (12). A wet soil sample is placed in a sample preparation chamber, the soil body is pressed into the cutting ring through the pressure device, the cutting ring is taken out after a test sample is prepared, the parts, at the two ends of the cutting ring, of the soil sample are smoothed, and the sample preparation work is completed. The remolding fine-grained soil test sample preparation device has the advantages that the device solves the problems that that remolding soil is prepared unevenly and the size of the test sample is limited and the air vent problems in the fine-grained soil preparation process, the dry density of the test sample is controllable and easy to unload, and the device is small in test sample preparation errors, convenient to operate and fast to prepare.