The invention discloses a manufacturing method of a thin-wall variable-curvature hollow blade. The method is characterized by being a method for manufacturing the thin-wall variable-curvature hollow blade according to a profile curvature radius and layer number adjusting laser power. The rule of the influence of profile curvature radius change of the blade on a molten pool temperature field is found so as to find a molten pool temperature field distribution rule corresponding to different curvature radiuses. A method for stabilizing the temperature of a molten pool by changing laser power is provided so as to obtain the rule of the change of laser power along with the curvature radius. The change rule is combined with power change along with layer number and laser power on any layer and any curvature are found, so that a thin-wall blade sample with uniform wall thickness can be molded according to the change rule at a stable molten pool temperature.