The present invention provides a heat exchanger for a medical laser device. The present invention includes: a heat exchanger frame formed into a square shape by making tips of a plurality of outer frames combined orthogonally； a plurality of electric heat cores having both front and rear ends penetrating the outer frames of the heat exchanger frame to be arranged in the heat exchanger frame at designated intervals, and receiving heat from fluids flowing along the inside； a plurality of radiating fins arranged in parallel at designated intervals to be orthogonal to the electric heat cores to receive and radiate the head from the electric heat cores； a plurality of return bends combined with tips of the electric heat cores to sequentially connect the tips with each other to return the flow of the fluids, moving the electric heat cores arranged on a front position, so that the fluids flow along the electric heat cores arranged on a rear position； and a combined pair of bend fixing members while surrounding the outer surface of all of the return bends around the return bends, combined with the tips of the cores, separately in two directions to fix the return bends to the electric heat cores respectively. As such, the present invention is capable of improving cooling efficiency by enabling the return bends as well as the radiating fins to perform cooling with a refrigerant, and forming the return bends and bend fixing members into one module body, thereby simplifying the installation and separation of the return bends to make the maintenance of the return bends and electric heat cores more convenient.본 발명은 복수의 외곽프레임들 끝단이 서로 직교로 결합되어 사각 형태의 틀을 이루는 열교환기틀과, 전, 후방측 양단이 상기 열교환기틀의 외곽프레임을 관통하여, 상기 열교환기틀 내부에 지정 간격으로 병렬 배열되고, 내부를 따라 유동하는 유체의 열을 전달받는 복수 개의 전열코어와, 상기 열교환기틀 내부에 상기 복수의 전열코어들과 직교를 이루도록, 지정 간격으로 병렬 배열되어, 상기 전열코어에서 열을 전달받아 방열하는 복수 개의 방열핀과, 상기 열교환기틀의 외곽프레임을 관통하는 전열코어들의 끝단에 결합되어, 병렬로 배열된 전열코어들의 끝단을 서로 순차 연결하여, 선 위치상에 배열된 전열코어를 따라 유동하는 유체의 흐름을 후 위치상에 배치된 전열코어를 따라 유동하도록 되돌리
