A detachable curved plate type heat exchanger mainly comprises a rectangular barrel. The detachable curved plate type heat exchanger is characterized in that the barrel is formed by welding four steel plates, the rectangular barrel is connected with two side blanking plates through flanges by using bolts, an S-shaped heat exchanging plate is fixed on the two side plates of the rectangular barrel by welding and divides a heat exchanging space into a cold fluid flowing area and a hot fluid flowing area, a cold fluid flowing out pipe orifice and a cold fluid flowing in pipe orifice are formed in the cold fluid flowing area, a hot fluid flowing in pipe orifice and a hot fluid flowing out pipe orifice are formed in the hot fluid flowing area, baffle plates are fixed on the two side blanking plates and are inserted into clearances of the S-shaped heat exchanging plate respectively, cold fluid and hot fluid are made to flow with alternate directions, and sealing pads are arranged between the flanges and the two side blanking plates. The baffle plates are straight plates or corrugated warp-shaped plates. According to the technical scheme, the detachable curved plate type heat exchanger is reasonable in design, compact in structure and simple in processing process. The heat exchanging area is enlarged, heat exchanging efficiency is improved, sealing performance is good, leakage is not prone to occurring, pressure resistance is high, the flow pass is large and not prone to being blocked, and the detachable curved plate type heat exchanger is suitable for heat exchanging of fluid containing suspended solids.