The invention relates to kelp noodle food and a production method thereof. The method comprises the following steps of: cleaning, desalting, dewatering and crushing kelp serving as a raw material, performing enzymolysis and pulping processing on the kelp at normal temperature and normal pressure; solidifying the kelp pulp and protecting color of the kelp pulp after the kelp pulp is subjected to extrusion molding in vacuum to form dark green kelp noodles with solidified surfaces; dynamically aging the noodles at room temperature, and protecting the color of the noodles to form kelp noodles which are uniformly solidified inside and outside and have constant green color; curing the noodles to improve the tensile strength; and finally cleaning, packaging and sterilizing the noodles to obtain the finished product. The method is performed at normal temperature and normal pressure, ensures the quality in aspects of nutrition, color, taste and the like of the food. The method for producing the kelp noodle food has the advantages of reasonable process, rich raw material resources, high operability and easy industrial production realization.