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Opportunistic infections caused by Pseudomonas aeruginosa(P. aeruginosa) are particularly difficult to treat due to the altered membrane permeability and inherent resistance to conventional antibiotics. Here, a cationic glycomimetics is designed and synthesized with aggregation‐induced emission (AIE) characteristics namely TPyGal, which self‐assembles into the spherical aggregates with galactosylated surface. TPyGal aggregates can effectively cluster P. aeruginosathrough multivalent carbohydrate‐lectin interactions and auxiliary electrostatic interactions and subsequently trigger membrane‐intercalating, which results in efficient photodynamic eradication of P. aeruginosaunder white light irradiation by in situ singlet oxygen (1O2) burst to disrupt bacterial membrane. Furthermore, the results demonstrate that TPyGal aggregates promote the healing of infected wounds, indicating the potential for clinical treatment of P. aeruginosainfections. An aggregation‐induced emission (AIE)‐active cationic glycomimetics is developed to self‐assemble into the spherical aggregates capable of agglutinating bacteria and further membrane‐intercalating, which exhibits highly efficient photodynamic eracdiation of P. aeruginosaand promotes the healing of infected wound by in situ singlet oxygen (1O2) generation under white light irradiation.