The invention discloses an optical-fiber sensing signal processing front-end circuit, and is suitable for the field of sensors. The front-end circuit comprises the following modules: a signal source,an amplification circuit of the signal source, an optical transmitter, and an optical receiver circuit. The circuit is compact in structure, is small in size, is stable in operation, is good in adaptability, improves the work efficiency, is low in power consumption, and is good in anti-interference performance and reliability.