The invention discloses a novel gas-liquid heat-exchange device, comprising a main heat exchange plate and a plurality of auxiliary heat exchange fins. The device is characterized in that a liquid inlet and a liquid outlet are formed on the main heat exchange plate; a main liquid inlet channel and a main liquid outlet channel connected with the liquid inlet and the liquid outlet respectively are arranged inside the main heat exchange plate; the auxiliary heat exchange fins are vertically and alternately distributed on the main heat exchange plate in parallel, a liquid inlet subchannel and a liquid outlet subchannel which are respectively connected with the main liquid inlet channel and the main liquid outlet channel are arranged in each auxiliary heat exchange fin, and a plurality of secondary subchannels which are in vertical through connection with the liquid inlet subchannel and the liquid outlet subchannel are arranged in each auxiliary heat exchange fin. The novel gas-liquid heat-exchange device achieves the aim of heat exchange just by own structure and natural convection of air, reduces the volume, saves the cost, and prolongs the service life.