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Highlights The common performance optimization strategies of smart composite hydrogel are summarized. The recent advanced progress of smart composite hydrogel-based wearable sensors is systematically discussed from the aspect of health monitoring. The current challenges and future prospects of smart composite hydrogel-based wearable sensors are presented.

Highlights: The common performance optimization strategies of smart composite hydrogel are summarized. The recent advanced progress of smart composite hydrogel-based wearable sensors is systematically discussed from the aspect of health monitoring. The current challenges and future prospects of smart composite hydrogel-based wearable sensors are presented. Growing health awareness triggers the public's concern about health problems. People want a timely and comprehensive picture of their condition without frequent trips to the hospital for costly and cumbersome general check-ups. The wearable technique provides a continuous measurement method for health monitoring by tracking a person's physiological data and analyzing it locally or remotely. During the health monitoring process, different kinds of sensors convert physiological signals into electrical or optical signals that can be recorded and transmitted, consequently playing a crucial role in wearable techniques. Wearable application scenarios usually require sensors to possess excellent flexibility and stretchability. Thus, designing flexible and stretchable sensors with reliable performance is the key to wearable technology. Smart composite hydrogels, which have tunable electrical properties, mechanical properties, biocompatibility, and multi-stimulus sensitivity, are one of the best sensitive materials for wearable health monitoring. This review summarizes the common synthetic and performance optimization strategies of smart composite hydrogels and focuses on the current application of smart composite hydrogels in the field of wearable health monitoring. [ABSTRACT FROM AUTHOR]