The invention relates to a dual frequency impedance matching based microstrip rectifier circuit, comprising a rectifier circuit, an input connector, a dual frequency impedance matching circuit and a harmonic wave suppression circuit. The rectifier circuit includes two rectification branches; the harmonic wave suppression circuit includes two harmonic wave suppression branches; the output ends of the two rectification branches are connected with the input ends of the two harmonic wave suppression branches respectively. The output end of the input connector is connected with the input end of the dual frequency impedance matching circuit and the output end of the dual frequency impedance matching circuit is connected with the input ends of the two rectification branches respectively. Compared with the prior art, the circuit of the invention is advantageous as follows: 1) the adoption of improved [pai]-shaped microstrip matching method achieves a dual-frequency matching effect and improves the energy utilization efficiency; 2) the arrangement of symmetrical differential structures and the capacitors in parallel suppress the second harmonic waves, reduce the size of the circuit, and improve the integration; and 3) the use of a four-times differential rectifier circuit improves the output voltage of a DC load.