The invention provides a laser welding and testing integrated method for a condensation pipe. The method comprises the steps that a welded condensation pipe workpiece is assembled and is clamped and fixed, a U-shaped pipe is inflated with protective gas, and a laser machining head is moved to the joint position; a welding laser beam is output, a multi-freedom-degree mechanical arm is used for controlling the movement of the laser machining head, a focusing laser beam conducts one-circle scanning along the stand column pipe installing hole outline position, and an integral annular welding lineis formed; in the scanning process, the laser power is adjusted in real time, and a laser ring welding line is obtained; through an automatic lifting device, the condensation pipe workpiece obtained after welding is immersed in water, air tightness of the condensation pipe workpiece under the standard testing air pressure is tested, and when points of solder skips are found, welding is conducted again; or otherwise, hot air is adopted for blowing-dry after automatic elevating. According to the laser welding and testing integrated method for the condensation pipe, integrated and automatic laserwelding and testing and online welding defect repairing of the U-shaped condensation pipe are achieved, and the technical problems about automatic welding and online automatic welding line quality testing of the kind of components for a long term are solved.