The invention discloses a boost/buck type 24-pulse self-coupling transformation rectifier, and solves the problem that a traditional 24-pulse self-coupling transformation rectifier cannot adjust voltage. A voltage adjustment is performed according to an input and output voltage ration of an autotransformer. A voltage vector direction, i.e., a dotted terminal direction, of partial windings of three-phase primary sides is changed, so a boost/buck function is achieved, and the wide-scope voltage output object is reached. A connection mode of primary and secondary side windings of the autotransformer and voltage vector lengths of the windings are reasonably designed, and then an each-phase four-group phase shift 15-degree and equal-amplitude transformer output voltage is obtained. A high-performance low-ripple DC voltage output is achieved through the autotransformer, four groups of rectifier bridges and balance reactors. The boost/buck type 24-pulse self-coupling transformation rectifier described in the invention has the advantages of the low input current harmonic wave content and the small transformer equivalent capacity, and is suitable for the industry and especially for the aviation field.