If the water-soluble cutting oil is sucked into the air using the chip cleaner, only the chips are caught in the net and it can be reused as clean water-soluble cutting oil without foreign substances. By cleaning and filtering the chips and cutting oil in the processing equipment once every 1-2 months, the replacement cycle of cutting oil is extended to reduce costs, and the environment in the workplace is improved by preventing the corruption of the cutting oil in the processing equipment.