The invention provides a metal-supported integral catalyst transition coating slurry, and a metal-supported integral catalyst transition coating and a preparation method thereof. The slurry comprises, by weight, 12-31.5 parts of catalyst support, 1.2-10.5 parts of metal powder, 1.2-7 parts of glass fibers and 6-14 parts of binder. The coating is prepared by using the surface of the metal support to support the slurry and drying and calcining under a protective environment. The coating prepared by the slurry has the advantages that the coating has high thermal stability, the adhesive force between the coating and the metal support is high, and the problem that the coating easily falls off from the surface of the metal support is solved effectively.