The invention relates to a preparation method and a device of ZnO and a diluted magnetic semiconductor material thereof in intense magnetic field, pertaining to the technical field of (magnetic) semiconductor material technology. The preparation method adopts zinc salt, a precipitating agent and a doped metal salt solution as raw materials; according to that the molar ratio between the precipitating agent and the zinc salt is 1:1 to 12:1, the molar ratio between metal salt and the zinc salt is 0.1:100 to 20:100, and the filling degree of a high-pressure reaction kettle is 50 percent to 90 percent, reaction products are obtained from reaction which is based on a hydro-thermal method and carried out in an intense magnetic field with the magnetic field intensity of 1T to 70 T (tesla), at the temperature of 100 DEG C to 400 DEG C and in the reaction kettle for 0.5h to 36h, and then the products are dried at the temperature of 50 DEG C to 400 DEG C for 0.5h to 6h, thus obtaining ZnO or a diluted magnetic semiconductor powder material doped with metal ions. The ZnO powder material prepared by the method has high purity, uniform doping and controllable microstructure, and the ZnO-based diluted magnetic semiconductor powder material prepared by doping certain metal ions has ferromagnetism at room temperature.