Recent progress in anti-freezing, anti-drying, and anti-swelling conductive hydrogels and their applications is reviewed. Conductive hydrogels are soft, hydrophilic materials with controllable stretchability, conductivity, and biocompatibility. However, traditional hydrogels have poor environmental tolerance due to high water content and hydrophilic networks, leading to swelling, freezing, and dehydration. To address these issues, environmentally tolerant conductive hydrogels (ETCHs) have been developed, which possess anti-freezing, anti-drying, and anti-swelling properties. These hydrogels are applied in wearable sensors, bioelectrodes, soft robots, and wound dressings. The review summarizes recent strategies for designing ETCHs, including the use of salt solutions, organic solvents, and surface modification. Salt solutions lower the freezing point and reduce water evaporation, while organic solvents like DMSO and glycerol improve anti-freezing and anti-drying properties. Surface modification with hydrophobic layers prevents water loss and freezing. Additionally, multiple crosslinking mechanisms enhance swelling resistance. The review also discusses the applications of ETCHs in human motion sensing, bioelectrodes, soft actuators, and wound dressings. These hydrogels offer excellent stability and durability in extreme environments, making them promising for future flexible sensing and biomedical applications.Recent progress in anti-freezing, anti-drying, and anti-swelling conductive hydrogels and their applications is reviewed. Conductive hydrogels are soft, hydrophilic materials with controllable stretchability, conductivity, and biocompatibility. However, traditional hydrogels have poor environmental tolerance due to high water content and hydrophilic networks, leading to swelling, freezing, and dehydration. To address these issues, environmentally tolerant conductive hydrogels (ETCHs) have been developed, which possess anti-freezing, anti-drying, and anti-swelling properties. These hydrogels are applied in wearable sensors, bioelectrodes, soft robots, and wound dressings. The review summarizes recent strategies for designing ETCHs, including the use of salt solutions, organic solvents, and surface modification. Salt solutions lower the freezing point and reduce water evaporation, while organic solvents like DMSO and glycerol improve anti-freezing and anti-drying properties. Surface modification with hydrophobic layers prevents water loss and freezing. Additionally, multiple crosslinking mechanisms enhance swelling resistance. The review also discusses the applications of ETCHs in human motion sensing, bioelectrodes, soft actuators, and wound dressings. These hydrogels offer excellent stability and durability in extreme environments, making them promising for future flexible sensing and biomedical applications.