Waste heat recovery system for fish farm according to the present invention is provided with the raw water inlet pipe and the raw water discharge pipe to be vertically spaced apart from each other vertically on one side, and the waste water inlet pipe and vertically spaced apart on the side where the raw water inlet pipe and the raw water discharge pipe is formed A wastewater discharge pipe is provided, and a first flow path through which raw water flowed into the raw water inflow pipe is connected to the raw water discharge pipe, and the first flow path provides a first cross flow path that can be distributed in multiple stages in the vertical direction. A second flow path through which the wastewater introduced into the pipe is moved is formed to lead to the wastewater discharge pipe, and the second flow path may provide a second crossover flow path that may be distributed in multiple stages in the vertical direction, but the raw water and the wastewater may be heat exchanged in a non-mixed state. A heat exchanger in which the first heat exchanger plate and the second heat exchanger plate are alternately aligned, and are installed on the raw water discharge pipe and flow in the raw water discharge pipe. It is provided with a heater for heating the raw water to a predetermined temperature, and the raw water discharge pipe is installed to supply the raw water to the storage target tank, the waste water inlet pipe is installed to extend the waste water from the storage target tank to the heat exchanger. Waste heat recovery system for fish farms according to the present invention has the advantage that the heat exchange efficiency and heat flow efficiency for the heat exchange between the waste water and the raw water is extended.본 발명에 따른 양어장용 폐열회수시스템은 일측면에 수직상으로 상호 이격되게 원수유입관과 원수배출관이 마련되며, 원수유입관과 원수배출관이 형성된 측면상에 수직상으로 상호 이격되게 폐수유입관과 폐수배출관이 마련되며, 원수유입관으로 유입된 원수가 이동되는 제 1 유로가 원수배출관으로 이어지도록 형성되되 제 1 유로는 상하방향으로 다단으로 유통될 수 있는 제 1 교차유로를 제공하고, 폐수유입관으로 유입된 폐수가 이동되는 제 2 유로가 폐
