A low-cost fiber cantilever accelerometer based on intensity demodulation is proposed in this paper. The accelerometer consists of receiving fiber), emitting fiber, ceramic ferrule and ceramic sleeve, both the receiving fiber and emitting fiber are single-mode fiber (SMF). The sensitivity of the proposed accelerometer is analyzed theoretically. A prototype of the accelerometer is fabricated, and the experimental system is set up. The experimental results show that the accelerometer has a sensitivity of 71.5 mV/g and good phase frequency characteristic at the working bandwidth from 30 Hz to 1 000 Hz.