The invention discloses a hydraulic sprocket model baseboard translation trailer system, comprising a trailer baseboard, a baseboard translation cylinder, driving gears, driven gears, a baseboard shaft, a driving chain, a driven chain, two double-acting chain cylinders and translation rollers. The baseboard translation cylinder and the two double-acting chain cylinders are respectively connected with a hydraulic automatic control system. The baseboard adopts a modular design and can be used for test of models with different sizes. The whole hydraulic sprocket model baseboard translation trailer system achieves the hydraulic automatic control, has the advantages of convenient test, simple operation, and large power and high efficiency of chain transmission, and can ensure the model to be smoothly moved in and out of the model test device.