Injectable wet-adhesive hydrogels represent a promising approach for managing traumatic hemorrhage, yet their clinical translation is often hindered by excessive swelling and inadequate sealing stability. Herein, we report an injectable hydrogel (denoted as PACmC) with rapid coagulation, ultrahigh burst pressure tolerance, and low swelling properties for emergency hemostasis and long-term wound management. PACmC hydrogel is formed by electrostatic self-assembly of aminated carboxymethyl chitosan