A multibank series cyclic twinkling LED lamp string. Several LED lamps are sequentially connected in parallel into a lamp group unit in an order in which two adjacent lamps are in opposite directions, one upward, the other downward. Several lamp group units are connected in series into an LED lamp string. An input pin of the first LED of the first lamp group unit of the LED lamp string is electrically connected to a first output end of a control unit, and an input pin of the last LED of the last lamp group unit of the LED lamp string is electrically connected to a second output end of the control unit, and the positive polarity and the negative polarity of the first output end and the second output end which are controlled by the control unit are circularly interchanged. The present invention belongs to the technical field of LED lamp strings, and has the advantages of greatly reducing the assembly costs of manual wiring and applying to an ornamental LED lamp string.
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