The invention provides hydrogen-rich water for intestinal hydrotherapy and a preparation device of the hydrogen-rich water. When intestinal hydrotherapy is conducted, the preparation device of the hydrogen-rich water is used for producing the hydrogen-rich water, the produced hydrogen-rich water is introduced into an intestinal tract by using a spraying pipe so as to perform intestine cleaning, and after the intestinal tract is cleaned, probiotic bacteria and prebiotics are sprayed into the intestinal tract through the spraying pipe so as to regulate the intestinal environment; the preparationdevice of the hydrogen-rich water comprises a main body, an ion exchange membrane, a cathode plate, an anode plate and a hydrogen dynamic equilibrium device, wherein the cathode plate is arranged atthe upper part of the ion exchange membrane, the ion exchange membrane, cathode plate and the anode plate are all arranged at the bottom of the main body, and a hydrogen-rich water discharging mouth and a water inlet are also formed in the lower side of the main body; through the preparation device, the hydrogen solubility can be increased, and water can be stirred automatically through a simple structure according to a real-time dissolution condition of hydrogen, no motors and the like are needed for drive, and the cost is low, so that the hydrogen is uniformly dissolved in the water, and thequality of the hydrogen-rich water is improved.