The invention belongs to the technical field of hydrogen production in thermochemical pathways and in particular relates to a microwave heating hydrogen production plant based on a thermochemical cycle as well as a hydrogen production method and application. The hydrogen production plant comprises a microwave generator, a gas cylinder, a vapor generator, a superheater and a reactor, wherein the microwave generator is connected with the reactor and is used for performing microwave heating on catalysts in the reactor; the gas cylinder and the vapor generator are communicated with the superheater; the superheater is communicated with the reactor; and the reacted catalysts are metallic oxides supported on silicon carbide ceramic foam. Compared with the traditional heat treatment manner, the microwave heating hydrogen production plant disclosed by the invention has the advantages that the power consumption is low by performing microwave heating on the metallic oxides, and an effective energy utilization rate is greatly improved.