The invention relates to a crystal separator and relative method, wherein said method comprises that: adhering crystal on adhesive element; matching adhesive element on frame; using smelt device to clamp the frame, to fix the crystal; then rotating one rolling wheel to roll on adhesive element; using rolling wheel to function the tool marks on crystal, to separate the crystal into several crystals; since rolling wheel can uniformly function the crystal and the force direction can be controlled, and the edge of separated crystal is flat. The invention can improve yield.