The invention relates to porphyra extract fibers, which can be used in the fields of medicine, food and biological degradation. The manufacturing method comprises the following steps: extracting a porphyra extract and manufacturing the fibers. By adopting the manufacturing method, the defects that the traditional sea product extract is low in spinning capacity and low in strength can be overcome, and the porphyra extract fibers with good strength and low swelling property can be rapidly prepared by virtue of the process.