The utility model provides a cold inner loop water pH adjusting module of system of direct current current conversion station valve includes the main jar three body in highly basic resin jar, highly acid resin jar and the sodium type resin jar, and highly acid resin jar and sodium type resin jar are parallelly connected to be arranged to establish ties with highly basic resin jar, control out water pH value through the valve opening who adjusts between highly acid resin jar and sodium type resin jar. Through this module, can turn into the ion that easily appeared the aquatic na+, reduce the inner cooling water scale deposit, through this ion jar, the pH value of adjustable water conservation reduces the corrosion rate of equipment, uses this ion jar, and the cost of resin is lower with the contrast of raw water treatment device, and life is longer.