The invention relates to a method for a preparing complicated shape bonded magnet by utilizing a 3D (three-dimensional) printing technology, and belongs to the technical field of complicated shape bonded magnet preparation. According to the method, firstly, magnetic alloy powder, bonding agents and auxiliary agents are melted and mixed, then, a magnetic wire with a certain diameter is prepared through extrusion, next, a spray nozzle of 3D printing equipment is utilized for melting and accumulating the magnetic wire, in addition, orientation and curing are carried out, and finally, a required bonded magnet product with specific magnetism and complicated space shape is printed. The method has the advantages that the very thin bonded magnet (smaller than 0.4mm) with any complicated space shape can be prepared, the dimensional precision of the product is high, the product can be further subjected to magnetization and orientation control in the printing process, an isotropic or anisotropic permanent magnet product can be prepared, in addition, a blank and a mold are not needed in the printing process, raw materials can be greatly saved, the production efficiency can be improved, the process is stable and reliable, the operability is high, the repeatability is high, and the method is applicable to the batch production of the complicated shape bonded magnet.