The present invention relates to a polymer composite for Helicobacter pylori recognition and a use of same. In particular, the present invention has confirmed that a water-soluble polymer-photosensitizer composite coupled to sialyl lactose that selectively binds to the surface of Helicobacter pylori exhibits desirable selectivity and binding strength to Helicobacter pylori strains, and upon laser irradiation, the photosensitizer within the composite generates singlet oxygen, thus effectively inducing the inactivation of Helicobacter pylori. Accordingly, by providing the composite as a polymer composite for Helicobacter pylori recognition, the present invention provides a Helicobacter pylori photodynamic therapy agent to enable an effective detection of Helicobacter pylori in the gastrointestinal tract while addressing antibiotic resistance issues of the conventional art.