The invention relates to a determination method for chloride ions of foods, which belongs to the technical field of food analysis. The method takes a chloride ion selective electrode as an indicator electrode and a two-liquid junction saturated calomel electrode as a reference electrode which are inserted in a sample solution to form a working battery, and when the concentration of chloride ions is in a range of 1 to 10-5g / L, the battery electromotive force is linear with the logarithm of chloride ion activity, and the concentration of the chloride ions of the foods is determined by a digital ion meter. The method of the invention adopts ultrasonic extraction and direct reading concentration method coupling techniques to determine the chlorine content in samples, and the used ultrasonic cleaning device greatly improves extraction speed; and the method has the obvious advantages of difficult sample contamination, low reagent consumption, simpleness and rapidity, accurate and reliable result.