The invention discloses a novel wet lixiviated material heat exchanging system and a heat exchanging method thereof. The novel wet lixiviated material heat exchanging system comprises a first heat exchanger and a pressurized lixiviation kettle. The first heat exchanger comprises a first shell body, a first left distribution board, a first right distribution board and a plurality of first heat exchanging pipes, wherein the first left distribution board and the first right distribution board are arranged in a first accommodating cavity at intervals, a first feeding port is formed in the wall of a first left cavity, and a first discharging port is formed in the wall of the first left cavity or the wall of a first right cavity; the left ends of the multiple first heat exchanging pipes are connected with a plurality of first left through holes and the right ends of the multiple first heat exchanging pipes are connected with a plurality of first right through holes. An inlet for fluid to enter the pressurized lixiviation kettle communicates with the first discharging port. According to the novel wet lixiviated material heat exchanging system, the fluid to enter the kettle can be heated effectively in a long time period, the heat exchanging system has the advantages of being good in heating effect, long in service life, stable in material discharging, easy to control, small in vibration and the like, and a pressurized lixiviation reaction can be conducted effectively and smoothly.