The working principle: The working principle of the condenser online cleaning device is: the ball launcher sends the rubber ball into the condenser, the rubber ball passes through the inner wall of the heat exchange tube depending on the water pressure difference, wipes away the dirt on the inner wall of the heat exchange tube, recovers the rubber ball at the cooling water outlet through the ball receiver to the ball launcher to form a cleaning cycle, and sets the cleaning frequency and times through the microcomputer control program to achieve the automatic online cleaning function. Always keep the inner wall of the condenser clean and have the highest heat exchange efficiency.