The manufacturing technology of plastic heat exchanger includes fluoroplastic heat exchanger manufacturing technology, polypropylene heat exchanger manufacturing technology and polyethylene plastic heat exchanger manufacturing technology. The plastic heat exchanger has good corrosion resistance, especially the fluoroplastic heat exchanger has good temperature resistance (- 200 ~ 200 ℃)! Through the use of advanced welding technology, plastic heat exchanger is used as cooler, condenser, heater and evaporator in the chemical industry, pickling, electric power, boiler exhaust, medicine, electroplating and other industries where strong corrosion resistance is required.