The invention relates to a shellfish cold-processing device, and solves the problem that the quality of dry shellfish is influenced by the fact that heating exists in the traditional shellfish drying and processing process. The shellfish cold-processing device comprises a freezing chamber, a slicing machine, a vacuum freeze-drying chamber and a packaging machine in sequence, wherein the freezing temperature of the freezing chamber maintains between -4 DEG C and 0 DEG C; the vacuum freeze-drying chamber is a vacuum environment with the temperature between -45 DEG C and -35 DEG C; a material preparing chamber is arranged on the inlet side of the vacuum freeze-drying chamber; a vacuum-pumping valve is arranged between the vacuum freeze-drying chamber and the material preparing chamber; the vacuum-pumping valve exhausts air from the vacuum freeze-drying chamber to the material preparing chamber. The shellfish cold-processing device finishes slicing cold processing on the shell fish by the forms of freezing, slicing, performing vacuum freeze-drying and packaging, so the original flavor of the shellfish can be maintained well; the materials are prepared layer by layer by multiple layers of material preparing frames and are vibrated and flattened, so that the stacking thickness of the shellfish meat in the vacuum freeze-drying process is reduced; air is exhausted from the vacuum freeze-drying chamber to the material preparing chamber to conduct precooling, so that the drying efficiency is improved and the drying effect is guaranteed.