The embodiment of the invention discloses a signal noise elimination method used for RFID, and a device and a circuit thereof. The method comprises the steps as follows: firstly, receiving a signal subjected to amplification demodulation; secondly, conducting high-frequency noise filtering on the signal through band-pass filtering; thirdly, conducting signal amplification on the signal subjected to the high-frequency noise filtering; fourthly, conducting low-frequency noise filtering on the signal subjected to the signal amplification. In the embodiment of the invention, through multi-level noise elimination processing, the noise in the signal is eliminated at great extent, and the influence of the noise on the signal processing is lowered.