The invention provides a single ion capacitor, a micro capacitor and an ion capacitor. The single ion capacitor is a capacitor formed by using a single water molecule as a medium and having a single positive ion and a single negative ion on both ends of the single water molecule under the action of an electric field; the micro capacitor is a capacitor formed by using rock particles wrapping water films as a medium and having a single positive ion sheath and a single negative ion sheath on both ends of the rock particles wrapping water films; and the ion capacitor comprises the said single ion capacitor and the said micro capacitor. The invention can help further study the change rules of rock capacitance.
