Abstract: An optical fiber surface electric field screening apparatus, comprising an extractor, the extractor being provided with an optical fiber, the optical fiber being prepared so as to form in the middle thereof a thinned part having a diameter of 15 ?m or less, causing a surface of the thinned part to generate a negative electric charge, capable of being used to attract a cell having a surface carrying a positive electric charge, e.g., attracting a cardiac cell, an endothelial cell or a bacterium to surround the thinned part, achieving the effect of screening and extracting cells.