The invention relates to a preparation method for a hydrogen-resistance permeation layer on the surface of metal hydride. According to the preparation method for the hydrogen-resistance permeation layer on the surface of the metal hydride, source materials containing carbon oxygen or nitrogen oxygen or carbon-nitrogen oxygen are sealed in a reaction vessel with metal hydride matrices, the pressure is controlled between 1.010<5> Pa-101 kPa, and the temperature is controlled to rise from the room temperature to 200-900 DEG C; the carbon oxygen or the nitrogen oxygen or the carbon-nitrogen oxygen is diffused to the surfaces of the metal hydride matrices and conducted in-situ reactions with metal elements of the matrices; and the dense and continuous composite hydrogen-resistance permeation layer which contains the carbon oxygen or the nitrogen oxygen or the carbon-nitrogen oxygen can be obtained after cooling. The hydrogen-resistance permeation layer is tightly combined with the matrices, is moderate in thickness, has an excellent hydrogen-resistance performance and can effectively prevent the hydrogen desorption of the metal hydride when used at the temperature of 200-900 DEG C. The hydrogen-resistance permeation layer on the surface of the metal hydride and the preparation method thereof are simple in operation, high in adaptability, and are not restricted by shapes and structures of complex matrices.