A single coil vibrating string sensor signal analyzer system is designed in order to monitor safety pressure of coal mine, oil mines, dams, bridges and other fields in this paper. The system includes excitation circuit, pick-up circuit and frequency measurement part with equal precision. The excitation circuit generates sweep pulse signal by single chip microcomputer. Vibration string sensor is excited by driving isolation circuit composed of HCPL3120 chip. The pick-up circuit enlarges the weak sinusoidal signal output by the sensor to form a square wave signal, then reads it into the single chip microcomputer for equal precision frequency measurement. Finally, this system realizes the excitation of the single-coil vibrating wire sensor, verifies the output waveform of the circuits at all levels and completed the measurement of sensor output frequency which have great project promotion value monitoring the safety pressure of coal mines, oil fields, dams, bridges and other fields more accurately.