The invention discloses a manufacturing method of a hidden jacquard elastic cord. The method includes the following steps of firstly, taking a material, wherein nylon wires, polyester wires and spandex are taken and placed into a warping machine to be warped, yarn dividing, yarn penetrating and buckle penetrating are conducted after a pan head is placed on a jacquard machine creel; secondly, arranging pattern chains, wherein the pattern chain arranging is conducted according to design requirements; thirdly, reading a disk, wherein design data is extracted on a computer to an electromagnetic valve assembly to form a jacquard warp yarn three-layer structure; fourthly, conducting adjusting, wherein two weft yarns are pressed into a hook groove of a knitting needle through a weft pressing hookrod when two weft yarn needles fly to one side of the knitting needle; fifthly, a jacquard machine is started to work according to the adjusting result of the fourth step so that the product of a three-layer structure can be obtained. The elastic cord has the advantages of being simple in structure, low in manufacturing price, good in attractiveness, high in adaptability and capable of displayingthe tightness degree.