The traditional single-phase rectification system is a boost system, so it requires an additional output buck link in low-voltage applications. The double buck rectifier can directly realize single-stage buck rectification, and has power decoupling function, which can suppress the secondary ripple in the DC side. Firstly, the problem of secondary power coupling in the traditional rectification system was analyzed, and then the working principle and hardware parameter design of the interleaved double buck rectifier were studied. On this basis, the interleaved pulse width modulation strategy based on single carrier was presented to simplify controller design. Finally, the single-stage buck rectification, power decoupling and interleaved pulse width modulation of the interleaved double buck sing-phase rectifier were verified by experiments.