Disclosed is an apparatus of a four-surface flat wire-free packaging type radar transceiving assembly. The apparatus comprises a cover plate and an integrated box body composed of a ring frame and a substrate. The cover plate is welded to the top portion of the ring frame, the bottom portion of the ring frame is welded to the periphery of the front surface of the substrate, a plurality of first pads are arranged at positions, which are close to the side edge of the substrate, at the periphery of the bottom surface of the substrate, the first pads are bent and extend to the side edge of the substrate, the first pads are arranged in pairs at the periphery of the substrate, second pads connected with the bottom surfaces are arranged in the middle of the first pads, the front surface of the substrate is provided with a radar transceiving circuit, and the first pads are electrically connected with the radar transceiving circuit through plated through holes. According to the invention, by use of an advanced QFN-like packaging technology, the substrate used for device loading and circuit wiring is directly taken as one part of a package, and a base of the assembly box body is omitted. Besides, a connector-free interface technology and a cascading feed technology are employed, such that surface mounting and cascading application of the transceiving assembly are realized, the transceiving assembly is miniaturized and light in weight, and the profile height and the quality surface density of an active antenna panel can be effectively reduced.