The invention discloses a miniaturized multi-peak equalizer based on vector synthesis. The equalizer comprises a microstrip layer, a dielectric layer and a metal layer which are sequentially stacked from top to bottom, the micro-strip layer comprises a first transmission line main line, a second transmission main line and a multi-stage power distribution-synthesis structure composed of a first-stage power divider structure surface layer micro-strip, a second-stage power divider structure surface layer micro-strip, a third-stage power divider structure surface layer micro-strip and a fourth-stage power divider structure surface layer micro-strip. The multi-stage power distribution-synthesis structure is utilized to realize multi-channel distribution and vector synthesis of microwave signals, the equalization is realized at a plurality of specific frequency points, and when a plurality of frequency bands are required to be attenuated, the equalization can be realized by adopting a multi-stage power divider, so that a relatively large equalization amount can be realized, and the miniaturization is realized.