Abstract: This paper proposes a novel dual-frequency rectifying circuit for low input power, which is consisted of dual-frequency match stub, rectifying diodes and a DC-pass filter. The two impedances of the diode at different frequencies are matched to 50W by the match stub, while the DC-pass filter blocks the fundamental frequency and the higher order harmonics. On the condition of 1 mW input power, during measured circuit, the result of rectifying efficiencies are 72.6% and 68.1% at 850 MHz and 1900 MHz, respectively. The measured conversion efficiencies of 47% and 81.4% are obtained at 850 MHz and 1900 MHz. The output could reach 0.85 V, when receiving both frequency signals, with the RF-DC conversion efficiency of 60.8%. The performance in low input power is advanced in domestic which has practical value in the application of RFID and the wireless power supply for embedded sensing electronic equipment.