The invention discloses a lamp strip manufacturing method. The method comprises the steps that firstly, a whole FPC and a fixing device are provided, and a second gluing layer with the changeable viscosity is arranged on the surface of the fixing device; secondly, the whole FPC is pasted to the second gluing layer of the fixing device; thirdly, all welding elements are welded to a bonding pad of the whole FPC; fourthly, the viscosity of the second gluing layer of the fixing device is reduced; and fifthly, the whole FPC is peeled off from the second gluing layer of the fixing device. According to the manufacturing device, the bad situations of inclination, pseudo soldering, unevenness and the like of the welding elements due to extrusion between a mother plate FPC and a single FPC in the whole FPC during SMT reflow soldering can be prevented.