The invention relates to a NiTiO3/TiO2 catalyst for water photolysis for producing hydrogen, and a preparation method and a use thereof. The catalyst is prepared from Ni(NO3)2 and HTNT. The inventionalso provides the preparation method of the catalyst. The photocatalyst is prepared by a hydrothermal in-situ reaction, and the prepared catalyst is a homogeneous one-dimensional nanotube. The NiTiO3/TiO2 nanotube catalyst prepared by the method has a stable structure and stable properties, can be repeatedly used to catalyze the water photolysis reaction for producing hydrogen, and still has excellent stability after being repeatedly used multiple times.