Abstract: A stretchable, skin-mountable and wearable strain sensor is important because of its possible applications in monitoring our daily life and work, such as robotic intelligent equipment, health-monitoring, human motion detection and remote precise diagnosis. A linen fabric-derived carbon (LDC) has been rationally integrated with 2D graphene and 1D silver nanowires by impregnation of the linen fabric with a graphene oxide suspension followed by carbonization and final impregnation with a suspension of silver nanowires. The Ag nanowires/graphene/linen-derived carbon (Ag-GLDC) composite sensor exhibits excellent stretchability (>60%), good cycling stability, and high sensitivity with gauge factors of 11.2, 36.8 and 74.5 for strains of 0-20%, 20%-40%, 40%-60%, respectively. The composite sensor has been successfully used to monitor the vigorous motion of human body joints (wrist, knee and elbow), suggesting its potential use in human motion detection. This work provides a new method for the preparation of flexible and wearable composite strain sensors with high performance.