The invention relates to a preparation method for a ceramic particle prefabricated part with a complex structure, and belongs to the field of composite materials. In order to overcome the problems that the conventional composite material prefabricated part is complex in preparation process, a prefabricated part with a complex spatial structure is difficult to prepare, strength of the prefabricated part is low, and wettability of metal liquid ceramic particles is poor, the invention adopts a method of three-dimensional digital modeling, laser selective cladding combined micro powder activating to prepare the ceramic particle prefabricated part with high strength, the complex spatial structure and high porosity; and the prefabricated part prepared by the preparation method is used to prepare a composite material part with the complex spatial structure and excellent performance. According to the preparation method, one or more of ceramic and metal micro powder are mixed in certain proportion to obtain a mixture, the mixture is mixed with ceramic particles after being ball-milled, a prefabricated part digital model is layered in a direction perpendicular to the Z direction, the material mixture of active micro powder and the ceramic particles spreads on a material bed layer by layer, selective laser cladding is performed, a workbench descends by one layer thickness every time cladding at one layer is completed, and cladding is performed layer by layer to finally obtain the whole prefabricated part.