The invention belongs to the technical field of radar electronic equipment, and specifically relates to a synthesizer structure for a radar. The structure comprises a box body, a conductor, a cover plate, and a connector. The box body is fixedly connected with the cover plate, thereby forming a cavity. The conductor is located in the cavity, and the connector is located outside the cavity. Moreover, the connector is connected with the conductor. According to the invention, the box body, the cover plate and the connector jointly form a closed cavity space, and the conductor is located in the cavity. Moreover, the bottom of the inner side of the box body is provided with a plurality of separation blocks which are located at the central part of a branch where the left and right subtrees of each layer of a full binary tree, thereby enabling connectors to be isolated with each other to a certain degree, and meeting the design requirements of the electromagnetic compatibility of the electronic equipment. Meanwhile, the conductor is of a four-layer full binary tree structure, is small in size, is high in integration degree, and meets the modular design requirements of the electronic equipment. The structure improves the integrity and shielding performance of a synthesizer, and improves the operation reliability of the synthesizer structure.