In order to meet the lowpower IoT node application in the 5G environment, this paper proposes a new type of harmonic suppression load structure in rectifier circuit, which introduces a continuous multiorder microstrip harmonic suppression structure behind the diode to achieve higher conversion efficiency and lower output ripple. The compact circuit has low design cost and simple structure. When the input power is14.8 dBm, the conversion efficiency can reach 72.5%. Finally, the F4B substrate is selected for experimental verification. The results show that when the load is 750Ω, the highest conversion efficiency of the circuit can still reach 61.2%, which is significantly improved compared to other structures.