The invention provides a cup joint hollow copper pipe manufacturing method based on laser cutting and welding. The cup joint hollow copper pipe manufacturing method includes the following steps that one end of a hollow copper core is inserted into a hollow copper pipe; an electronic optical shutter beam splitter is connected to the output end of a laser device; welding laser beams are output to conduct fixed point welding; cutting laser beams are output to cut off the hollow copper core; a pipe side end laser circumferential weld of a cup joint section is welded; the cup joint section continuously rotates at a constant speed, and fusion brazing filler metal is controlled to drop into a core side end of the cup joint section from a flow guide pipe in an inclined manner; welding laser beams are output, and laser fusion brazing is achieved; the hollow copper pipe with one welded end is overturned horizontally by 180 degrees; and the above steps are repeatedly executed, and welding of the other end of the hollow copper pipe is completed. A cup joint section welding connector obtained through the method comprises the high-quality pipe side end laser circumferential weld and one smooth laser fusion soldered seam, the problem that leakage is easy is solved, and the sufficient overall strength mechanical property of the cup joint connector is guaranteed. The invention further provides a cup joint hollow copper pipe manufacturing device.