The present invention relates to a staggered parallel-connection type three-phase PWM rectifier system, which comprises N PWM rectifying converters, wherein N is larger than or equal to 2. An A-phaseinput end is connected with the original winding of a first transformer, and a B-phase input end is connected with the original winding of a second transformer. A C-phase input end is connected to theoriginal winding of a third transformer. The above three transformers are respectively provided with N secondary windings. The n secondary windings of the first transformer, the n secondary windingsof the second transformer and the n secondary windings of the third transformer are correspondingly connected with the alternating-current side of an n PWM rectifying converter, wherein n=1, 2, .., N. The direct-current sides of all PWM rectifying converters are connected in parallel to form a system output end. The PWM rectifying converters are connected in parallel, so that the current stress inside a switching tube can be reduced. Meanwhile, based on the staggered parallel technology, the fluctuation of the total input current and the harmonic of the current are reduced. Meanwhile, thehigh-frequency fluctuation of the total output voltage and the interference are reduced.