A highly sensitive curvature sensor based on core-offset splicing is proposed and demonstrated. The whole fabrication process is quite simple and the sensor head is cost effective. Measurement results show that it has a high sensitivity of −22.947nm/m −1 in the range from 0.35312m −1 to 2.8127m −1 . Temperature sensitivity of 77.6pm/°C within the range of 20–80°C has also been achieved, which implies the possibility for measurement of temperature. High sensitivity and low-cost make it a preferable candidate for small curvature sensing with high resolution in practical applications.