The invention relates to a triple oscillation feedback weak signal processing circuit which including an offset voltage self-calibration front end current mode amplification circuit, a current mode phase subtraction integrator, a current mode oscillator, a digital differential circuit, a self-calibration feedback loop, a filter feedback loop and an oscillation feedback loop, wherein the offset voltage self-calibration front end current mode amplification circuit determines low-pass filtering of the signal processing circuit to a signal and a self-calibration function to sensor offset voltage; the current mode phase subtraction integrator determines integration of the signal processing circuit to signal errors and a high-pass filtering function to the signal; and the oscillation feedback circuit loop improves the accuracy for processing a weak signal. The triple oscillation feedback weak signal processing circuit is used for a subsequent signal processing chip circuit of a small signal sensor, and a signal processing function of low energy consumption and high accuracy of sensor chip integration is realized.