The invention discloses a band-pass feed-forward sigma-delta modulator. The modulator comprises three cascaded switched-capacitor resonator modules, an adder module, a quantizer module and a feedback digital to analog conversion (DAC) module. In the sigma-delta modulator, a feed-forward structure is adopted instead of a common feedback structure, and input ends of resonators only include quantization noise components rather than input signal components, so that input levels of the resonators are lowered, and the loop stability of the whole sigma-delta modulator is enhanced. Thus, the band-pass feed-forward sigma-delta modulator disclosed by the invention is suitable for an analog to digital converter with a high-order single-loop structure, and the requirements of a modulator circuit for analog sub-circuits such as operational amplifiers are lowered. As indicated by a simulation result, the band-pass feed-forward sigma-delta modulator disclosed by the invention reach a dynamic signal-to-distortion ratio range from 96.8dB to 106dB under the conditions of a power supply voltage being 3.3V, a clock frequency being 800KHz, a central frequency being 200KHz and a signal bandwidth being 5KHz, and meets the application requirements of micro mechanical sensor systems such as high-accuracy gyroscopes and acceleration sensors.