A method for regulating a phase transformation of a hydrogen-containing transition metal oxide, comprising steps of: S100, providing a hydrogen-containing transition metal oxide having a structural formula of ABO x H y, wherein the hydrogen-containing transition metal oxide is in form of a first phase, A is one or more of alkaline earth metal elements and rare-earth metal elements, B is one or more of transition metal elements, x is a numeric value in a range of 1 to 3, and y is a numeric value larger than 0 and smaller than or equal to 2.5; S200, soaking the hydrogen-containing transition metal oxide with a first ionic liquid capable of providing hydrogen ions and oxygen ions; and S300, applying a gating voltage to the hydrogen-containing transition metal oxide through the first ionic liquid as a gate to regulate the phase transformation of the hydrogen-containing transition metal oxide; wherein the method for making the hydrogen-containing transition metal oxide comprises steps of: S110, providing a transition metal oxide having a structural formula of ABO z, wherein z is greater than or equal to 2 and smaller than or equal to 3; S120, soaking the transition metal oxide with a second ionic liquid, wherein the second ionic liquid is capable of providing hydrogen ions and oxygen ions by ionizing water; and S130, applying an electric field to the transition metal oxide to cause the hydrogen ions in the second ionic liquid to insert into the transition metal oxide; characterized in that the step S130 comprises steps of: S132, providing a second electrode and a power source; S134, disposing the second electrode to be spaced from the first electrode and connecting the second electrode and the first electrode electrically and respectively to the power source; and S136, soaking the second electrode with the second ionic liquid, and applying an electric field in a direction from the second electrode to the first electrode by the power source. S100, providing a hydrogen-containing transition metal oxide having a structural formula of ABO x H y, wherein the hydrogen-containing transition metal oxide is in form of a first phase, A is one or more of alkaline earth metal elements and rare-earth metal elements, B is one or more of transition metal elements, x is a numeric value in a range of 1 to 3, and y is a numeric value larger than 0 and smaller than or equal to 2.5; S200, soaking the hydrogen-containing transition metal oxide with a first ionic liquid capable of providing hydrogen ions and oxygen ions; and S300, applying a gating voltage to the hydrogen-containing transition metal oxide through the first ionic liquid as a gate to regulate the phase transformation of the hydrogen-containing transition metal oxide; wherein the method for making the hydrogen-containing transition metal oxide comprises steps of: S110, providing a transition metal oxide having a structural formula of ABO z, wherein z is greater than or equal to 2 and smaller than or equal to 3; S120, soaking the transition metal oxide with a second ionic liquid, wherein the second ionic liquid is capable of providing hydrogen ions and oxygen ions by ionizing water; and S130, applying an electric field to the transition metal oxide to cause the hydrogen ions in the second ionic liquid to insert into the transition metal oxide; S110, providing a transition metal oxide having a structural formula of ABO z, wherein z is greater than or equal to 2 and smaller than or equal to 3; S120, soaking the transition metal oxide with a second ionic liquid, wherein the second ionic liquid is capable of providing hydrogen ions and oxygen ions by ionizing water; and S130, applying an electric field to the transition metal oxide to cause the hydrogen ions in the second ionic liquid to insert into the transition metal oxide; characterized in that the step S130 comprises steps of: S132, providing a second electrode and a power source; S134, disposing the second electrode to be spaced from the first electrode and connecting the second electrode and the first electrode electrically and respectively to the power source; and S136, soaking the second electrode with the second ionic liquid, and applying an electric field in a direction from the second electrode to the first electrode by the power source. S132, providing a second electrode and a power source; S134, disposing the second electrode to be spaced from the first electrode and connecting the second electrode and the first electrode electrically and respectively to the power source; and S136, soaking the second electrode with the second ionic liquid, and applying an electric field in a direction from the second electrode to the first electrode by the power source.