Reversible photochromic material as well as preparation method and application method thereof

The invention discloses a reversible photochromic material and a preparation method and an application method thereof, the reversible photochromic material has the composition of ABTi (1-x) O4: xR < n + >, and is characterized in that A is selected from at least one of Li, Na, K, Rb and Cs; b is selected from one or more of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Bi; r < n + > is at least one of Cu < 2 + >, Al < 3 + >, Ga < 3 + >, In < 3 + >, Fe < 3 + >, Co < 3 + >, Ge < 4 + > and Sn < 4 + >, and 0 < = xlt; and 0.1. The body color of the material is changed after the material is irradiated by ultraviolet light or X-ray with the wavelength of 200-395 nm, and the material is gray, orange, yellow, pink, green or blue after color change; in particular, when A is Na, B is composed of Y and Bi or Gd and Bi, and x = 0, the reversible photochromic material has a temperature-dependent multistage photochromic property. The reversible photochromic material has application value in the fields of