Abstract: A manufacturing method of a planar antenna is provided. Wherein, a plurality of antenna patterns and conductive patterns are simultaneously formed by the printing or electroless plating process. The conductive patterns which string the antenna patterns are taken as the plating electrodes and a roll-to-roll manufacturing process is cooperated to plate the antenna patterns. Then, a cutting process is used to separate the electroplated antenna patterns and the conductive patterns to respectively form the individual antenna structure. The manufacturing method has the advantages of speedy manufacture, mass production and low cost.