The invention discloses a method for machining a large-caliber ultralong copper coil pipe. The method comprises the steps of 1, casting, wherein a copper-base alloy is molten and solidified to form asolid copper ingot; 2, extruding, wherein the copper ingot is extruded into a round pipe blank; 3, rolling, wherein the round pipe blank is rolled into a rolled blank pipe; 4, combined drawing, wherein a movable core mark procedure is adopted for drawing the rolled blank pipe four times, during each drawing, the drawing modular angle is set to be 30 degrees, the movable core mark angle is 22 degrees, after each drawing is completed, the rolled blank pipe is coiled through a coiling machine, when next drawing is carried out, the coiled rolled blank pipe is straightened through an uncoiler, thelast drawing is completed, and the finished pipe is formed; 5, annealing, wherein the finished pipe is annealed through a gas protection pass-type two-frequency annealing furnace in a passing-while-annealing manner, the annealing temperature ranges from 520 DEG C to 550 DEG C, and the passing speed of the finished pipe is smaller than or equal to 2 mm/min; and 6, winding, wherein the annealed finished pipe is wound. According to the method, the large-caliber ultralong copper coil pipe can be machined.