The invention discloses a novel high-efficiency heat exchanger and a molding method thereof. The novel high-efficiency heat exchanger comprises a box body, as well as a cold fluid inlet pipe, a cold fluid outlet pipe, a hot fluid inlet pipe and a hot fluid outlet pipe which are fixedly arranged on the box body, wherein the box body is internally provided with a honeycomb which is connected with the cold fluid inlet pipe, the cold fluid outlet pipe, the hot fluid inlet pipe and the hot fluid outlet pipe to form a cold fluid passage and a hot fluid passage for performing heat exchange, and the novel high-efficiency heat exchanger is processed and formed by virtue of a selective laser melting method. According to the novel high-efficiency heat exchanger and the forming method thereof disclosed by the invention, the novel high-efficiency heat exchanger is high in heat exchange efficiency and reliability; by virtue of performing layer-by-layer laser scanning on melting and molding, the limiting of the traditional technology is avoided, the design freedom degree of a designer is improved, and the processing time is short.