The invention discloses a novel heat exchanger core, and belongs to the technical field of mechanical design. The novel heat exchanger core comprises etching plates, forming plates and partition plates; heat exchange runners are etched on the etching plates, and each heat exchange runner is composed of a direct runner and an oval runner which are alternatively arranged; the direct runners and the oval runners are communicated; the long axes of the oval runners and the central axes, in the liquid flowing direction, of the direct runners are located on the same straight line; the n etching plates and the m forming plates are alternatively arranged, wherein n is larger than or equal to 1, m is larger than or equal to 1, and m and n are both positive integers; the position between the etching faces of adjacent etching plates and the forming plates, the position between the two adjacent forming plates and the position between the etching faces of the two adjacent etching plates are each provided with one partition plate; according to the heat exchanger core, the characteristics of a micro-channel heat exchanger and a plate type heat exchanger are integrated, the use condition that the working medium cleaning degree is not high is met, and the novel heat exchanger core can be particularly suitable for the cooling working procedure of natural gas of an offshore work platform.